[Bug 110659] pageflipping seems to cause jittering on mouse input when running Hitman 2 in Wine/DXVK with amdgpu.dc=1

[Bug 110659] pageflipping seems to cause jittering on mouse input when running Hitman 2 in Wine/DXVK with amdgpu.dc=1

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https://bugs.freedesktop.org/show_bug.cgi?id=110659

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|git                         |unspecified
           Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org
          Component|Driver/AMDgpu               |DRM/AMDgpu
            Product|xorg                        |DRI
                 CC|                            |nicholas.kazlauskas@amd.com
         QA Contact|xorg-team@lists.x.org       |

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
(In reply to tempel.julian from comment #0)
> The issue does not occur when:
> [...]
> -using legacy DC via amdgpu.dc=0

Probably a DC issue then.

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--- Comment #4 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
What's the latest commit in your WIP kernel?

I know there was a regression caused by:

https://patchwork.freedesktop.org/patch/304544/

that forces full updates on every commit leading to pretty poor performance. I
have a patch that fixes this that didn't make into that set of DC patches.

But I also don't think this last set is merged yet into amd-staging-drm-next,
so it's likely something other than this - and likely something in the legacy
codepath if disabling atomic support in modesetting causes the issue.

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--- Comment #5 from tempel.julian@gmail.com ---
Yes, it also happens with Linux 5.1.

It btw. runs fine on xwayland inside a Plasma Wayland session.

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--- Comment #6 from tempel.julian@gmail.com ---
Situation is unchanged with 5.3-wip.

It also occurs with amdvlk instead of radv if you turn on pageflipping via
UseFlipHint,1 in amdPalSettings.cfg (for incomprehensible reasons it is
disabled by default and the amdvlk developers unfortunately seem to ignore user
complaints regarding it).
Instead of pageflipping, the issue can also be triggered with amdvlk +
TearFree.

Btw: There is a free demo of Hitman 2 on Steam, it might work out of the box
with Steam Play/Proton.


-----

Little off-topic:
I head to re-write this entire comment because freedesktop.org servers are a
nightmare. Complete migration to GitLab would be great thing.

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--- Comment #7 from tempel.julian@gmail.com ---
Playing Skyrim with Gallium Nine also shows this issue, it makes the games
unplayable.
Is it really certain that it's an amdgpu.dc problem when the modesetting DDX
doesn't show this issue?

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--- Comment #8 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
Do you happen to know if this was a regression?

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--- Comment #9 from tempel.julian@gmail.com ---
Until I get a new GPU or a FreeSync display, I use amdgpu.dc=1 only for testing
purposes. So I can't judge if this is a regression or has always existed.
But I gave Linux 4.19.46 LTS a try and it shows the same behavior.

Hm, maybe no one noticed because pageflipping wasn't working before this
commit?
https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/commit/bf61e6d7ac1a5754b1026d7f80acf25ef622c491
Will retest with latest stable versions of xorg / amdgpu DDX.

It's btw. really not happening in every game, e.g. Elex seems to be fine.

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--- Comment #10 from tempel.julian@gmail.com ---
Nope, not related to it. Happens also with stable versions.

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--- Comment #11 from tempel.julian@gmail.com ---
Happens also with plain wined3d inside official Steam Proton builds. In case of
Skyrim, it is also affects the rendering performance and thus is visible in the
frametime graph (unlike Hitman 2 with DXVK):
https://abload.de/img/screenshot_20190527_1t1ktp.png

Those spikes occur by just moving the mouse. Pressing keyboard buttons don't
trigger them.

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--- Comment #12 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
I'm wondering if this is the async cursor update bug again. Maybe something
with WINE or the game is trying to swap cursor buffers frequently and it's
interacting with the cursor double buffering in xf86-video-amdgpu.

We still can't do fast cursor updates for swapping cursor framebuffers because
we'll hit page faults that can kill the driver due to the cursor framebuffer
not being properly refcounted.

The fix for this particular bug is still under review in DRM. I plan on
removing the restriction I added in amdgpu DM after the fix has been merged.

But for now, whenever the cursor swaps framebuffers we can't perform fast
cursor updates so we're forced to wait for the previous flip to finish and the
vblank event to be sent back to userspace. This can cause small jitters
depending on how often the cursor is updating and when it updates during the
vblank interval.

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--- Comment #13 from tempel.julian@gmail.com ---
Thanks for letting me know!
Could you please provide me with a loose estimate if those general atomic
modesetting performance limitations can be overcome in the next months? Would
really put my mind at ease. :)

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--- Comment #14 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
(In reply to tempel.julian from comment #13)
> Thanks for letting me know!
> Could you please provide me with a loose estimate if those general atomic
> modesetting performance limitations can be overcome in the next months?
> Would really put my mind at ease. :)

The core bits + the bits that affect amdgpu are reviewed. But I think it's
still waiting on review from maintainers of the other drivers the patch
impacts. I wouldn't expect it to land before 5.3 or even 5.4 at the earliest
unfortunately.

I would still need to debug to know for sure if that's the actual bug that's
going on here but it seems likely given that it's atomic DC + cursor movement +
xf86-video-amdgpu that's causing the issue.

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--- Comment #15 from tempel.julian@gmail.com ---
Well, hope on the horizon.

If applying debug patches would be helpful for trying to shed light into this
issue, I would of course do it.

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--- Comment #16 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
Created attachment 144354
  --> https://bugs.freedesktop.org/attachment.cgi?id=144354&action=edit
0001-drm-amd-display-Allow-fast-updates-again-for-swappin.patch

Sure, you can try the patch I've attached on applied after series fixing the
problem in DRM:

https://patchwork.kernel.org/cover/10837847/

Not sure if that applies cleanly, however. The important patches from should
be:

https://patchwork.kernel.org/patch/10837849/
https://patchwork.kernel.org/patch/10837853/

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--- Comment #17 from tempel.julian@gmail.com ---
I applied your patch and patches 1 and 3 of that series on linux 5.2-rc2, but
it unfortunately doesn't show any effect:
-There is still the mouse input issue for the games described in this ticket.
-Opening new windows still creates stutter.
-And so do gamma adjustments via RedShift.

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--- Comment #18 from tempel.julian@gmail.com ---
Huh, with modesetting driver, those patches eliminate the stutter when new
windows are shown. Does the xf86-video-amdgpu driver need adjustments for this?

However, turning on nightlight in Plasma Wayland still causes stutter, which is
not there with amdgpu.dc=0.

RedShift btw. is completely broken with amdgpu.dc=1 + modesetting DDX, it
simply has no effect anymore (not related to the experimental atomic
modesetting patches).

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--- Comment #19 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
(In reply to tempel.julian from comment #18)
> Huh, with modesetting driver, those patches eliminate the stutter when new
> windows are shown. Does the xf86-video-amdgpu driver need adjustments for
> this?

It should eliminate stuttering for that case in xf86-video-amdgpu if it's the
problem I think it is (double buffering the cursor).

> 
> However, turning on nightlight in Plasma Wayland still causes stutter, which
> is not there with amdgpu.dc=0.

1. Gamma updates are slow updates that do a lot of register programming.
Nightlight and RedShift issue a lot of these updates.

2. Gamma updates, like everything that isn't a cursor update, currently target
the next vblank period.

3. If the pageflip is in a separate commit or update than the gamma update,
then it'll need to wait for the gamma update to finish and for the next vblank
interval. If this takes too long then we might miss the next vblank interval
and have to wait for the one after that.

I think it's a combination of these 3 issues. Even though it's Wayland and
should be using the full atomic API, I'm not sure if plasma is actually issuing
all that state in the same commit or not.

My guess would be no, since you're seeing the stuttering. We do have a bug with
(2) for legacy gamma updates, since there isn't really any reason those should
be waiting for the next flip / vblank other than to be consistent with the rest
of the atomic commit framework.

> RedShift btw. is completely broken with amdgpu.dc=1 + modesetting DDX, it
> simply has no effect anymore (not related to the experimental atomic
> modesetting patches).

Not sure what the issue here would be. Gamma seems to work fine for legacy and
atomic on amdgpu (we pass the IGT tests for this) and it works fine in legacy
desktops like GNOME on Xorg with the xf86-video-amdgpu DDX.

Was this still on Plasma, but on X?

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--- Comment #20 from tempel.julian@gmail.com ---
I forgot that I patched this PR into my Xserver:
https://gitlab.freedesktop.org/xorg/xserver/merge_requests/36
It is responsible for the blocked gamma adjustment and the better desktop
window performance of the modesetting Xorg driver with the experimental atomic
modesetting kernel patches vs. the xf86-video-amdgpu driver.

So, since everything got a bit messy, let me recap the results and add a few
more details:

-The experimental atomic modesetting kernel patches actually improve the
performance for desktop window usage for one aspect: When I open
www.vsynctester.com in Chromium and quickly hover the mouse cursor over my
system tray to trigger popup windows, this doesn't result in stuttering
anymore. The same applies to little text popups (e.g. URLs of links) during
regular web browsing. This is the case with both modesetting and
xf86-video-amdgpu, window compositing is enabled and 100% free of tearing at
the same time.

-But there is still stutter on www.vsynctester.com in Chromium (please don't
use Firefox for this, it even stutters on MS Windows when doing this...) when I
hide and show any other window, e.g. of running Dolphin file browser by
clicking its starter icon in the taskbar. It's just the window that is shown
and hidden, the program itself continues running all the time. This applies to
both modesetting and xf86-video-amdgpu driver.

-But when I apply the aforementioned "WIP: modesetting: Use atomic more
atomically" patch to Xserver (additionally to the experimental atomic
modesetting kernel patches), the modesetting driver is also 100% free of
stutter in this situation, while the xf86-video-amdgpu-driver is not.
Question is: Can this also be incorporated into the xf86-video-amdgpu driver?
This would be a VAST improvement, the stuttering during gamma adjustments imho
is not close to being as important.

-Now back to the stutter in games when moving the mouse: This is completely
untouched by all this. The xf86-video-amdgpu driver always show stuttering in
the mentioned games (as long as amdgpu.dc=1), while modesetting and also
xwayland don't.


Oof, I hope I didn't forget anything. ;)

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--- Comment #21 from tempel.julian@gmail.com ---
I'm open to trying out other patches, e.g. concerning double buffering for the
cursor. :)

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--- Comment #22 from tempel.julian@gmail.com ---
The Witcher 3 is affected as well (a bit less obvious, but still quite bad vs.
modesetting or amdgpu.dc=0). So, it seems this is a real dealbreaker for
playing games on Linux, which imho justifies to raise this ticket's priority.
:(

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tempel.julian@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|medium                      |high

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--- Comment #23 from tempel.julian@gmail.com ---
Any news on this? I'd really like to have this sorted out before I
wholeheartedly recommended Navi for Linux gaming.
I can imagine that Navi causes a ton of work, but still this issue is painful.

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[Bug 110659] pageflipping seems to cause jittering on mouse input when running Hitman 2 in Wine/DXVK with amdgpu.dc=1

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https://bugs.freedesktop.org/show_bug.cgi?id=110659

--- Comment #24 from tempel.julian@gmail.com ---
I've mentioned kwin-lowlatency in this ticket:
https://bugs.freedesktop.org/show_bug.cgi?id=108917#add_comment

It can be used as some kind of workaround for this wine issue, as the stutter
doesn't occur when kwin compositing (and thus vsync) is enabled on top of the
games' vsync.

Of course this is far from being optimal, as
1. It breaks FreeSync.
2. There is an additional backbuffer queue, causing additional input (or
perhaps better output) latency.
3. It may introduce additional stutter when framerate drops below refreshrate

---

FreeSync situation for wine games seems really terrible with due to this bug.
:(

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[Bug 110659] pageflipping seems to cause jittering on mouse input when running Hitman 2 in Wine/DXVK with amdgpu.dc=1

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--- Comment #25 from tempel.julian@gmail.com ---
Applying this MR and disabling HW cursor "fixes" the mouse skipping in the menu
of Hitman 2 (as there is a cursor visible and thus pageflipping is turned off):
https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/merge_requests/38

But in the actual game, there is no cursor visible and so there is severe
stutter again.

I also reported the bug to the wine devs (still I think this is rather a bug of
xf86-video-amdgpu):
https://bugs.winehq.org/show_bug.cgi?id=47428
There I mentioned that setting "MouseWarpOverride = disable" (a wine features
to work around/solve mouse issues) fixes the problem for wined3d/gallium nine.
However, it does not fix the issue in Hitman 2.

The issue in Hitman 2 also is a bit different, as it doesn't seem to have
slowdowns regarding the rendering performance, but instead the mouse input
rather seems to be partially blocked or discarded. But again: This does not
occur without xf86-video-amdgpu or amdgpu.dc=1.

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--- Comment #26 from Michel Dänzer <michel@daenzer.net> ---
(In reply to tempel.julian from comment #25)
> I also reported the bug to the wine devs (still I think this is rather a bug
> of xf86-video-amdgpu):

It's a kernel issue, not an xf86-video-amdgpu one.

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--- Comment #27 from tempel.julian@gmail.com ---
(In reply to Michel Dänzer from comment #26)
> It's a kernel issue, not an xf86-video-amdgpu one.
Thanks for clarifying.
I could also reproduce this issue with Doom OpenGL in Steam Play/Proton 4.9. As
soon as I move the mouse enough, there are frametime spikes (the red ones in
the "total" graph):
https://abload.de/img/screenshot_20190710_26sk21.png

When I turn off pageflipping in xorg config, the red spikes there are gone:
https://abload.de/img/screenshot_20190710_2k7k67.png

Luckily, the Vulkan renderer of the game doesn't show the issue. But it once
again makes clear that this bug can affect a wide variety of software in Wine.

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--- Comment #28 from tempel.julian@gmail.com ---
Situation is still unchanged with latest drm-next-5.4-wip kernel branch from a
few minutes ago. :(

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--- Comment #29 from tempel.julian@gmail.com ---
The patches by Nicholas are now merged in drm-next-5.4 branch (tested with
recent commit that bases the branch on 5.3-rc3), but the mouse input issue in
certain games is still unaffected.

I was also able to reproduce it with a different system (also with RX 580)
which features a 60Hz FreeSync display, it definitely makes FreeSync impossible
to use in the aforementioned titles.

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--- Comment #30 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
(In reply to tempel.julian from comment #29)
> The patches by Nicholas are now merged in drm-next-5.4 branch (tested with
> recent commit that bases the branch on 5.3-rc3), but the mouse input issue
> in certain games is still unaffected.
> 
> I was also able to reproduce it with a different system (also with RX 580)
> which features a 60Hz FreeSync display, it definitely makes FreeSync
> impossible to use in the aforementioned titles.

I still can't reproduce on any setup I've tried.

Here is the current setup I have:

RX580 1920x1080 @ 144Hz
amd-staging-drm-next (6c7a8d5c0772)
xf86-video-amdgpu 19.0.1-1
mesa 19.1.4-1
plasma-desktop 5.16.4-1

There are no spikes in the DXVK overlay in Hitman 2 when moving the mouse and
no noticeable jitter in input.

I am using plasma with the compositor enabled, tearing prevention auto and
fullscreen redirection allowed. PageFlip is enabled in xf86-video-amdgpu.

I do see stutters in the graph when moving the cursor over the mission tiles on
the menu, but this is GFX stuttering - not display. Moving the cursor at the
top of the screen in the menu produces no stuttering.

FreeSync isn't active since this is DXVK.

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https://bugs.freedesktop.org/show_bug.cgi?id=110659

--- Comment #31 from tempel.julian@gmail.com ---
Created attachment 145117
  --> https://bugs.freedesktop.org/attachment.cgi?id=145117&action=edit
new dmesg log with staging-drm-next kernel default parameters

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--- Comment #32 from tempel.julian@gmail.com ---
Created attachment 145118
  --> https://bugs.freedesktop.org/attachment.cgi?id=145118&action=edit
issue demonstrated with D9VK frametime graph in game Oblivion

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https://bugs.freedesktop.org/show_bug.cgi?id=110659

--- Comment #33 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
I haven't seen anything like the video in my testing. It also doesn't seem to
happen every time so I'm wondering if something else is going on in the
background that's issuing atomic commits.

Do you mind posting the relevant portion of a dmesg log after running the
following:

echo 0x52 > /sys/module/drm/parameters/debug

This will generate a ton of debug information and will likely kill your
performance, but if you can reproduce the portion of the frametime graph with
the red spikes and post that part of the log that would help.

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--- Comment #34 from tempel.julian@gmail.com ---
Thank you for being still with me on this.

I've downgraded to stock packages provided by Arch stable repository, which is:
xorg-server 1.20.5
xf86-video-amdgpu 19.0.1
mesa  19.1.4
stock (read: no) xorg config
no custom kernel parameters (except of of disabling intel_pstate, see new
dmesg.log attached)

And I've also installed amd-staging-drm-next (6c7a8d5c0772) just like you.

But: The issue is unchanged. To further illustrate the issue, I've recorded a
capture of it in the game TESV: Oblivion in D9VK (no difference to WineD3D or
Gallium Nine regarding this issue).

The capturing process in OBS Studio via Xcomposite breaks pageflipping, but I
can turn it on again via TearFree which I enable via hotkey on the fly. The
result 100% matches running the game with modesetting DDX or amdgpu.dc=0 (no
spikes) vs. xf86-video-amdgpu + amdgpu.dc=1 (nasty spikes).

Hitman 2 is a bit different, as it doesn't show render spikes for me either (I
think I was first mistaken regarding that difference, sorry for the confusion),
but the mouse input just blocks/skips heavily and is even more unplayable than
Oblivion/Skyrim etc.

I was just writing this while I read your new reply. I'll gladly try what you
have suggested.

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--- Comment #35 from tempel.julian@gmail.com ---
Created attachment 145119
  --> https://bugs.freedesktop.org/attachment.cgi?id=145119&action=edit
debug dmesg.log

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--- Comment #36 from tempel.julian@gmail.com ---
The log now starts at [ 2788.164016], I hope nothing important is cut out. Else
I'd have to recheck my log size limits.

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--- Comment #37 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
Are you running a color management tool in the background?

The difference between my setup and yours is that there isn't anything locking
the connectors hundreds of times per second and performing full updates.

This is confirmed in your log by lines like the following:

 [ 2788.165907] [drm:drm_atomic_add_affected_connectors [drm]] Adding all
current connectors for [CRTC:47:crtc-0] to 00000000acb155e9

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--- Comment #38 from tempel.julian@gmail.com ---
Huh, that seems suspicious. I'm not aware of any such a tool which would be
active for me all the time. I had redshift installed, but it wasn't running in
background, so not surprisingly uninstalling it and restarting the system
didn't help. There is  colord running, but killing its process didn't help
either.
So I'm a bit clueless how this comes. If I knew how, I'd try to turn it off.

Could you try manually disabling KWin compositing via Shift + Alt + F12 before
starting Hitman 2?
I just tricked myself when trying out Xfce instead of Plasma, but the reason
why Xfce wasn't showing the issue was that it didn't turn off compositing in
fullscreen (despite of an option telling otherwise). After manually turning off
compositing, the issue was the same as on Plasma without compositor.

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https://bugs.freedesktop.org/show_bug.cgi?id=110659

--- Comment #39 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
Disabling the compositor doesn't make a difference as far as stuttering goes
for Hitman 2's DXVK - I don't see any commits in the log that are lock the
connector and all the planes.

I don't have Oblivion on my machine to test, but I tried running the DX9
version of Heaven under proton and I don't see stuttering or any gamma/color
adjustment commits under that either. No issues with FreeSync when running it
either from what I can tell with vsync both on/off.

Those commits are definitely what's causing your stuttering, but I'm not sure
what's actually creating them. My initial guess was something in the
compatibility layer for DX9 games, but I don't see that on my setup.

Is it only Oblivion that has this issue for you?

I'm not sure how much of this can be a kernel level fix - I think we need to
lock all the planes whenever gamma or color adjustments have been made and that
probably includes the cursor plane as well. If the cursor plane is included
that will block asynchronous cursor updates from occurring until the color
adjustments have been done. This is why the cursor causes stuttering.

A check could potentially be made to not lock all the planes for redundant
color management commits, but I'm not sure if the color adjustments requested
are redundant or not. It could be the case that the application is requesting
different color adjustments every single time.

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--- Comment #40 from tempel.julian@gmail.com ---
Created attachment 145137
  --> https://bugs.freedesktop.org/attachment.cgi?id=145137&action=edit
video demonstrating the issue in Hitman 2 (different to Oblivion/Skyrim)

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--- Comment #41 from tempel.julian@gmail.com ---
Created attachment 145138
  --> https://bugs.freedesktop.org/attachment.cgi?id=145138&action=edit
debug dmesg.log after running Hitman 2 with the issue

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--- Comment #42 from tempel.julian@gmail.com ---
(In reply to Nicholas Kazlauskas from comment #39)
> Disabling the compositor doesn't make a difference as far as stuttering goes
> for Hitman 2's DXVK - I don't see any commits in the log that are lock the
> connector and all the planes.

Thanks for trying!

> I don't have Oblivion on my machine to test, but I tried running the DX9
> version of Heaven under proton and I don't see stuttering or any gamma/color
> adjustment commits under that either. No issues with FreeSync when running
> it either from what I can tell with vsync both on/off.

I've given Heaven a try, it doesn't show the issue for me either (DX9 via
D9VK).

> Those commits are definitely what's causing your stuttering, but I'm not
> sure what's actually creating them. My initial guess was something in the
> compatibility layer for DX9 games, but I don't see that on my setup.

I've attached a debug dmesg log after triggering the issue in Hitman 2. It is
also what is shown in the new video capture I've provided. As you can see,
there are no rendering spikes, but instead the mouse input (and perhaps
partially also keyboard) seems to be discarded a lot, causing such jumps. This
is also there without vsync enabled, but less obvious. Just like the render
spikes in Oblivion/Skyrim, this issue completely disappears by turning off
pageflipping in xorg config, switching to modesetting DDX or disabling atomic
modesetting via amdgpu.dc=0. I wonder if the log confirms that it's the same
issue (or the issue has the same roots)?

> Is it only Oblivion that has this issue for you?

I found out that also the native OpenGL renderer of Doom 2016 (which also has a
free demo on Steam) shows the same behavior as Oblivion/Skyrim, despite of no
3D API wrapper involved.
For whatever reason, the Vulkan renderer of the game doesn't show the issue, it
seems to run flawlessly with both pageflipping + vsync.

> I'm not sure how much of this can be a kernel level fix - I think we need to
> lock all the planes whenever gamma or color adjustments have been made and
> that probably includes the cursor plane as well. If the cursor plane is
> included that will block asynchronous cursor updates from occurring until
> the color adjustments have been done. This is why the cursor causes
> stuttering.

Would it be possible to provide a test patch that completely blocks any gamma
adjustment either in Xorg or the kernel? Then we'd have ultimate proof. :)

> A check could potentially be made to not lock all the planes for redundant
> color management commits, but I'm not sure if the color adjustments
> requested are redundant or not. It could be the case that the application is
> requesting different color adjustments every single time.

It seems some suboptimal behavior of Wine can trigger this issue, but I suppose
it would automatically be fixed together with this issue which I reported
regarding gamma adjustment performance and atomic modesetting:
https://bugs.freedesktop.org/show_bug.cgi?id=108917
I btw. can reproduce that issue by simply booting Fedora 30 Workstation Gnome
Live and enable the nightlight feature, the color grading phase makes
everything stutter.

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--- Comment #43 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
Created attachment 145139
  --> https://bugs.freedesktop.org/attachment.cgi?id=145139&action=edit
0001-drm-amd-display-Test-patch-for-disabling-color-adjus.patch

>From your video it looks like something is issuing a lot of full updates. Those
are slow enough that they can miss the current vblank window and be forced to
wait until the next one with vsync on.

I've attached a debug patch you can try that should disable color adjustments
from triggering full updates.

I've also added some debug information to know when full updates are being
issued in case it was something other than color management.

You can view that output with log level 4, ie.

echo 0x4 > /sys/module/drm/parameters/debug

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--- Comment #44 from tempel.julian@gmail.com ---
I applied the patch to linux 5.2 (among
0001-drm-amd-display-Allow-fast-updates-again-for-swappin.patch) and as
expected, gamma adjustments have stopped working.
Unfortunately, the games still show the issue.

Should the debug information be contained in dmesg? After doing
echo 0x4 > /sys/module/drm/parameters/debug
and starting Hitman 2, there don't seem to be any comprehensive debug
information inside the dmesg log, at least not to my layman eyes (attaching
right now nonetheless).

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--- Comment #45 from tempel.julian@gmail.com ---
Created attachment 145140
  --> https://bugs.freedesktop.org/attachment.cgi?id=145140&action=edit
new dmesg log with debug patch applied after starting Hitman 2

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--- Comment #46 from tempel.julian@gmail.com ---
Created attachment 145152
  --> https://bugs.freedesktop.org/attachment.cgi?id=145152&action=edit
new debug dmesg log saved after running Oblivion with drm-next kernel

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--- Comment #47 from tempel.julian@gmail.com ---
I got a new 1440p 144 Hz FreeSync display, and as expected, the issue is
unchanged with it.

With it, I've created a new debug dmesg log for render stutter in Oblivion,
this time with your patch applied to drm-next kernel.

Perhaps this could be interesting?


[  529.556752] [drm:drm_mode_addfb2 [drm]] [FB:79]
[  529.557106] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] VRR packet update:
crtc=47 enabled=1 state=3
[  529.557164] [drm:dc_commit_updates_for_stream [amdgpu]] debug: full update
issued
[  529.564401] [drm:drm_mode_addfb2 [drm]] [FB:86]
[  531.420971] [drm:drm_mode_addfb2 [drm]] [FB:95]
[  531.459067] [drm:drm_mode_addfb2 [drm]] [FB:96]
[  544.144771] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] VRR packet update:
crtc=47 enabled=0 state=2
[  544.145961] [drm:dc_commit_updates_for_stream [amdgpu]] debug: full update
issued
[  544.169447] [drm:drm_mode_addfb2 [drm]] [FB:79]
[  544.172953] [drm:drm_mode_addfb2 [drm]] [FB:94]

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--- Comment #48 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
(In reply to tempel.julian from comment #47)
> I got a new 1440p 144 Hz FreeSync display, and as expected, the issue is
> unchanged with it.
> 
> With it, I've created a new debug dmesg log for render stutter in Oblivion,
> this time with your patch applied to drm-next kernel.
> 
> Perhaps this could be interesting?
> 
> 
> [  529.556752] [drm:drm_mode_addfb2 [drm]] [FB:79]
> [  529.557106] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] VRR packet
> update: crtc=47 enabled=1 state=3
> [  529.557164] [drm:dc_commit_updates_for_stream [amdgpu]] debug: full
> update issued
> [  529.564401] [drm:drm_mode_addfb2 [drm]] [FB:86]
> [  531.420971] [drm:drm_mode_addfb2 [drm]] [FB:95]
> [  531.459067] [drm:drm_mode_addfb2 [drm]] [FB:96]
> [  544.144771] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] VRR packet
> update: crtc=47 enabled=0 state=2
> [  544.145961] [drm:dc_commit_updates_for_stream [amdgpu]] debug: full
> update issued
> [  544.169447] [drm:drm_mode_addfb2 [drm]] [FB:79]
> [  544.172953] [drm:drm_mode_addfb2 [drm]] [FB:94]

This is normal behavior for toggling into and out of VRR. I was expecting to
see was a log with hundreds of full updates issued, but since this isn't the
case I think it's something more fundamental with vblank timing though I'm
still not quite sure why it I can't reproduce it in my testing.

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--- Comment #49 from tempel.julian@gmail.com ---
Instead of my Arch installation, I tried a fresh Fedora 30 Workstation Gnome
installation. It shows the same behavior, so I think we can rule out a
packaging issue.

Too bad, this issue makes me boot Windows much more often. It's not really a
recommendable state. :(

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--- Comment #50 from tempel.julian@gmail.com ---
Are we already out of options for debug output? :)

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--- Comment #51 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
(In reply to tempel.julian from comment #50)
> Are we already out of options for debug output? :)

Might help to see what IOCTLs are being specifically called by userspace. I
think you can enable that log with:

echo 0x3f > /sys/module/drm/parameters/debug

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--- Comment #52 from tempel.julian@gmail.com ---
Created attachment 145207
  --> https://bugs.freedesktop.org/attachment.cgi?id=145207&action=edit
dmesg ioctl log

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--- Comment #53 from tempel.julian@gmail.com ---
Hm, it seems that maximum log size isn't enough for even one whole second?

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--- Comment #54 from tempel.julian@gmail.com ---
Not sure if it was helpful, but I tried setting log_buf_len=131072 and ran
sleep 5s && dmesg in background while I was provoking the issue in Oblivion
(dmesg-ioctl_2.log).

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--- Comment #55 from tempel.julian@gmail.com ---
Created attachment 145208
  --> https://bugs.freedesktop.org/attachment.cgi?id=145208&action=edit
hopefully extended dmesg ioctl log

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--- Comment #56 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
It seems to be the frequent calls to DRM_IOCTL_MODE_SETPROPERTY that's causing
the issue but I'm not entirely sure what specifically it's trying to set that's
doing this.

This probably isn't triggering anything that really needs hardware programming
but it will end up waiting for all outstanding atomic commits to finish which
would likely explain the stuttering.

Does this patch improve the issue?

https://patchwork.freedesktop.org/patch/309217/?series=61778&rev=1

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--- Comment #57 from tempel.julian@gmail.com ---
Unfortunately unchanged :( . New log:

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--- Comment #58 from tempel.julian@gmail.com ---
Created attachment 145209
  --> https://bugs.freedesktop.org/attachment.cgi?id=145209&action=edit
new ioctl log with patch applied

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--- Comment #59 from tempel.julian@gmail.com ---
Created attachment 145222
  --> https://bugs.freedesktop.org/attachment.cgi?id=145222&action=edit
debug dmesg output for patch applied to drm-next

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--- Comment #60 from tempel.julian@gmail.com ---
I've applied your patch to current drm-next branch head (tag
drm-next-5.4-2019-08-30), situation is still unchanged. I've also attached a
new log with it. This time I ran Oblivion with Gallium Nine statetracker
instead of D9VK.

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--- Comment #61 from tempel.julian@gmail.com ---
Did I get it right that modesetting DDX and xwayland aren't affected by this
problem because xf86-video-amdgpu technically differs in some substantial
aspects?

Apart from FreeSync (which is triggered by pageflipping, thus disabling
pageflipping doesn't help at all as a workaround), it would be bearable if
modesetting DDX was usable. But then there is this bug, which forces the user
to play everything with vsync, which is not always desirable either:
https://gitlab.freedesktop.org/xorg/xserver/issues/629

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--- Comment #62 from tempel.julian@gmail.com ---
I could reproduce the issue on a system with a Radeon RX 5700 XT Navi 10 GPU +
drm-next kernel in Hitman 2. Really devastating.

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--- Comment #63 from Michel Dänzer <michel@daenzer.net> ---
Can you find out which property is getting set? If there's no (easy) way to get
that out of the kernel, one possibility is to (from another machine via SSH)
attach gdb to the Xorg process while an affected app is running, set
breakpoints in drmModeConnectorSetProperty and drmModeObjectSetProperty, and
get backtraces of where they're getting called from.

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--- Comment #64 from tempel.julian@gmail.com ---
I can try that. But I really wonder why there are differences between systems
showing the issue or not.

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--- Comment #65 from tempel.julian@gmail.com ---
@Nicholas
Since this commit, the modesetting driver shows the same behavior as
xf86-video-amdgpu:
https://gitlab.freedesktop.org/xorg/xserver/commit/f0d78b47ac49977a6007f5fe081f00c6eb19a12e

So, now only xwayland isn't affected. But I think this can very well be just
because Wayland compositors yet don't support turning compositing off in
fullscreen. We might see the same effect as on Xorg, where keeping some
compositors enabled seems to "fix" the issue (at the cost of high input
latency, other performance issues and non-functional FreeSync).

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--- Comment #66 from Michel Dänzer <michel@daenzer.net> ---
(In reply to tempel.julian from comment #65)
> Since this commit, the modesetting driver shows the same behavior as
> xf86-video-amdgpu:
> https://gitlab.freedesktop.org/xorg/xserver/commit/
> f0d78b47ac49977a6007f5fe081f00c6eb19a12e

Hmm, could the property update be part of the legacy => atomic compatibility
code in the kernel?


> So, now only xwayland isn't affected. But I think this can very well be just
> because Wayland compositors yet don't support turning compositing off in
> fullscreen.

They still use page flipping though, similar to TearFree. Which Wayland
compositor(s) have you tried?

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--- Comment #67 from tempel.julian@gmail.com ---
(In reply to Michel Dänzer from comment #66)
> They still use page flipping though, similar to TearFree. Which Wayland
> compositor(s) have you tried?

I have tried a Wayland Gnome and Plasma session, in both cases the render
stutter of Oblivion and the "mouse blocking" of Hitman 2 are gone.

But: As I have stated earlier, this can also be achieved on Xorg with Xfce's
xfwm  and kwin-lowlatency (a KWin fork with different vsync implementation)
compositing. They also trigger pageflipping and thus achieve a tearig free
result.
I would guess that having that extra vsync + extra backbuffer queue of a
compositor can avoid that "collision" of pageflipping + mouse input, in which
case we can't be sure if Wayland really isn't affected.

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--- Comment #68 from tempel.julian@gmail.com ---
I did it, but it stopped after hitting the two breakpoints the first time
without me having moved the mouse at all. I suppose this isn't enough? Would it
be possible to provide me with a short hint how to let it run longer? I'd have
to read quite some doc pages otherwise.

Anyhow, here's the log.

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--- Comment #69 from tempel.julian@gmail.com ---
Created attachment 145278
  --> https://bugs.freedesktop.org/attachment.cgi?id=145278&action=edit
1st gdb log

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--- Comment #70 from Michel Dänzer <michel@daenzer.net> ---
(In reply to tempel.julian from comment #68)
> I did it, but it stopped after hitting the two breakpoints the first time
> without me having moved the mouse at all. I suppose this isn't enough? Would
> it be possible to provide me with a short hint how to let it run longer?

Enter "continue" (or just "c") at the gdb prompt to continue, and wait for a
few breakpoint hits, to see if they're getting hit from multiple places.

Also, make sure debugging symbols are available for
/usr/lib/xorg/modules/drivers/amdgpu_drv.so (and ideally also for Xorg and its
modules), otherwise the backtraces are useless.

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--- Comment #71 from tempel.julian@gmail.com ---
Hope this helps:

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--- Comment #72 from tempel.julian@gmail.com ---
Created attachment 145280
  --> https://bugs.freedesktop.org/attachment.cgi?id=145280&action=edit
2nd gdb backtrace log, now with debug symbols

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--- Comment #73 from Michel Dänzer <michel@daenzer.net> ---
Looks like some client repeatedly calls XForceScreenSaver (probably to prevent
the monitors from blanking), which results in the DPMS property getting re-set
over and over. Nicholas, maybe the kernel could ignore such no-op property
"updates"?

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--- Comment #74 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
(In reply to Michel Dänzer from comment #73)
> Looks like some client repeatedly calls XForceScreenSaver (probably to
> prevent the monitors from blanking), which results in the DPMS property
> getting re-set over and over. Nicholas, maybe the kernel could ignore such
> no-op property "updates"?

Even if it's no-op update it's still going to be locking the connector and
potentially blocking other commits from occurring so ideally the client
userspace wouldn't be dong this.

I can try writing up a patch that doesn't lock everything if the connector
state hasn't change at the very least but I'm not sure if it will fully address
the issue or not.

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--- Comment #75 from tempel.julian@gmail.com ---
Is it possible that Wine or the affected programs in Wine are the clients that
are at fault for this?
As it happens with my Arch Plasma setup and also a fresh Fedora Gnome
installation, it seems impossible to identify the "culprit" for me.

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--- Comment #76 from Michel Dänzer <michel@daenzer.net> ---
(In reply to tempel.julian from comment #75)
> Is it possible that Wine or the affected programs in Wine are the clients
> that are at fault for this?

Certainly. It looks like the intention is to prevent the monitors from entering
power saving mode.

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--- Comment #77 from tempel.julian@gmail.com ---
(In reply to Michel Dänzer from comment #76)
> Certainly. It looks like the intention is to prevent the monitors from
> entering power saving mode.

I turned DPMS off in Xorg config which leaves the issue unchanged. Is this to
be expected?

I'll open a ticket for the issue on the Wine tracker, but I'd still be happy to
try out any patch for Xorg or kernel.

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--- Comment #78 from Michel Dänzer <michel@daenzer.net> ---
(In reply to tempel.julian from comment #77)
> I turned DPMS off in Xorg config which leaves the issue unchanged. Is this
> to be expected?

Yeah, this isn't directly related to X's DPMS functionality.

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--- Comment #79 from Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> ---
(In reply to Michel Dänzer from comment #76)
> (In reply to tempel.julian from comment #75)
> > Is it possible that Wine or the affected programs in Wine are the clients
> > that are at fault for this?
> 
> Certainly. It looks like the intention is to prevent the monitors from
> entering power saving mode.

Maybe the code from this wine patch
https://www.winehq.org/pipermail/wine-devel/2018-July/129014.html
("winex11.drv: Wake up the display on user input") is causing this?

(adding a breakpoint in wine for the XResetScreenSaver function should confirm)

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tempel.julian@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTOURBUG
             Status|NEW                         |RESOLVED

--- Comment #80 from tempel.julian@gmail.com ---
Oh my. I've tried the oldest Proton build offered by Steam, which is based on
Wine 3.7, and indeed it doesn't show the issue (neither in Oblivion with
wined3d OGL nor Hitman 2 DXVK Vulkan). I tried with the older Proton 3.16
version before, which unfortunately is the one that started showing the issue.
I don't know why I didn't try 3.7 in the first place. I'm sorry for the time
you have invested into this issue. :(
Though it would appear to me that the old non-atomic DC is very resilient
toward such issues.
To be sure, I also tested with untouched Arch 5.2.13 kernel: Without that Wine
commit, it is totally free of that stutter issue as well.

Pierre-Eric, I reverted that commit c6b6935bb433dbbd30f5ba122a7c45ad3a2d6eed,
and indeed, it introduced this issue. Should I create a Wine bug ticket for
this?

Closing now. Big thanks @ Michel and Nicholas for their great support. AMD's
kernel and Linux windowing support is simply outstanding, a dam good reason to
stay with team (former) red. :)

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--- Comment #81 from Andrew Eikum <aeikum@codeweavers.com> ---
(In reply to Nicholas Kazlauskas from comment #74)
> (In reply to Michel Dänzer from comment #73)
> > Looks like some client repeatedly calls XForceScreenSaver (probably to
> > prevent the monitors from blanking), which results in the DPMS property
> > getting re-set over and over. Nicholas, maybe the kernel could ignore such
> > no-op property "updates"?
> 
> Even if it's no-op update it's still going to be locking the connector and
> potentially blocking other commits from occurring so ideally the client
> userspace wouldn't be dong this.
> 

I've submitted a patch to Wine to throttle our calls to XResetScreenSaver to
once every five seconds: https://source.winehq.org/patches/data/169958

However, I'd argue our previous behavior isn't obviously wrong. What we were
doing was calling XResetScreenSaver each time we received user input on a
joystick in order to delay the screensaver coming up despite no keyboard/mouse
input. It's not obvious that this behavior was incorrect. Are you sure you
shouldn't be able to handle this behavior from a client?

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--- Comment #82 from tempel.julian@gmail.com ---
(In reply to Andrew Eikum from comment #81)
> I've submitted a patch to Wine to throttle our calls to XResetScreenSaver to
> once every five seconds: https://source.winehq.org/patches/data/169958
> 
> However, I'd argue our previous behavior isn't obviously wrong. What we were
> doing was calling XResetScreenSaver each time we received user input on a
> joystick in order to delay the screensaver coming up despite no
> keyboard/mouse input. It's not obvious that this behavior was incorrect. Are
> you sure you shouldn't be able to handle this behavior from a client?

Thank you. Subjectively, I'd say it completely solves the issue. I don't see
any noteworthy spikes in frametime graphs and I haven't noticed any suspicious
stutter/blocking until now (will do some more tests to be sure).
I'd be very happy if this could be included in 4.17 to increase chances that it
gets picked up by one of the next Proton releases.

It'd be interesting to know at what calling rate the display driver starts to
have issues.

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--- Comment #83 from tempel.julian@gmail.com ---
Andrew, with your patch the issue is still there in a weak shape:
When I open the inventory in TES IV Oblivion, don't move the cursor for some
seconds and then move it again, there is always a frametime spike:
https://abload.de/img/screenshot_20190917_2f4jds.png

It's not there with XResetScreenSaver calls completely disabled in Wine (by
reverting the commit mentioned by Pierre-Eric). It appears 100% reproducible.

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--- Comment #84 from Andrew Eikum <aeikum@codeweavers.com> ---
If one call every five seconds is causing a problem, surely it's not Wine's
bug, right?

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--- Comment #85 from tempel.julian@gmail.com ---
Thanks for the new Proton release including your fix (didn't realize you are
the release manager :) ). As far as I can judge until now, the result is good
enough in practice. There is this this reproducible spike, but moving the
camera while in game seems free of stutter (a bit hard to judge, since the game
is very stuttery in general).

It's definitely not the only case where atomic modesetting is hypersensitive, I
wouldn't be surprised if it required some kind of rather comprehensive
restructuring to make it more resilient in general.
E.g. there is still this aforementioned problem with gamma adjustments:
https://bugs.freedesktop.org/show_bug.cgi?id=108917

And there is also weak stutter each time when other windows on Xorg receive
focus.

All those issues where non-existent with old legacy DC (amdgpu.dc=0 on Polaris
and older). Intel probably is affected the same.

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--- Comment #86 from tempel.julian@gmail.com ---
While the Gallium performance overlay clearly shows a spike in the game's GPU
render time, I'm fairly certain it doesn't exist in the actual display output.
It's not limited to the character inventory, but instead happens anywhere, even
in the main menu. But I neither can see the cursor skipping, nor the camera in
game, despite of the graph's spike.
I also noticed that there is no such spike when the framerate is below the
refreshrate.

I also tested if there's something similar to observe in Hitman 2: I reduced
visual fidelity to achieve constant 75fps/Hz with vsync, and it always seems to
be 100% free of stutter, also when resuming to move the mouse after suspending
it for a few seconds.

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