[Bug 105530] Stuttering on Raven Ridge when TearFree is on

[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #4 from Michel Dänzer <michel@daenzer.net> ---
(In reply to txtsd from comment #0)
> The stuttering is caused by enabling TearFree via xrandr.
> When on `auto`, there is no stuttering, but when enabled by setting it to
> `on`, there is intense stuttering noticeable when dragging windows around,
> but it's also very noticeable when just moving the mouse around on the
> desktop with no windows open.

Since HW cursor updates are always supposed to work without delay, and there is
no sign of an issue in the attached userspace information, this seems like a
kernel (DC?) issue.

In the amd-gfx mailing list thread, you said that this started on 2018-03-07.
Is that just when you enabled TearFree for the first time, or did this actually
not happen with older kernels?

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #5 from txtsd <thexerothermicsclerodermoid@gmail.com> ---
(In reply to Michel Dänzer from comment #4)
> (In reply to txtsd from comment #0)
> > The stuttering is caused by enabling TearFree via xrandr.
> > When on `auto`, there is no stuttering, but when enabled by setting it to
> > `on`, there is intense stuttering noticeable when dragging windows around,
> > but it's also very noticeable when just moving the mouse around on the
> > desktop with no windows open.
> 
> Since HW cursor updates are always supposed to work without delay, and there
> is no sign of an issue in the attached userspace information, this seems
> like a kernel (DC?) issue.
> 
> In the amd-gfx mailing list thread, you said that this started on
> 2018-03-07. Is that just when you enabled TearFree for the first time, or
> did this actually not happen with older kernels?

Yep. That was the first time I altered the TearFree property, and that's when
it first appeared. I hadn't noticed it prior to that.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #6 from txtsd <thexerothermicsclerodermoid@gmail.com> ---
Also, is there an older kernel I should try? Give me a branch/commit, and I'll
compile and see if the issue exists.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #7 from Mez <mezcalbert@hotmail.com> ---
This occurs for me on the below Polaris system as well. Timing matches the
dates in this thread. I've always had Tearfree option on though and it didn't
occur before these last few weeks.

OS: Ubuntu 18.04 bionic
Kernel: x86_64 Linux 4.16.0-rc6+ (M-bab custom kernel with amd-staging-drm-next
included)
DE: GNOME 
CPU: AMD A10-7860K Radeon R7, 12 Compute Cores 4C+8G @ 4x 3.9GHz [32.0°C]
GPU: Radeon RX 560 Series (POLARIS11 / DRM 3.25.0 / 4.16.0-rc6+, LLVM 6.0.0)+
Oibaf ppa

Graphics:  Card: Advanced Micro Devices [AMD/ATI] Baffin [Polaris11]
           Display Server: x11 (X.Org 1.19.6 ) driver: amdgpu Resolution:
1920x1080@59.79hz
           OpenGL: renderer: Radeon RX 560 Series (POLARIS11 / DRM 3.25.0 /
4.16.0-rc6+, LLVM 6.0.0)
           version: 4.5 Mesa 18.1.0-devel

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Mez from comment #7)
> I've always had Tearfree option on though and it didn't occur before these last
> few weeks.

Can you help narrow down whether this was introduced by a change in the kernel
or in xf86-video-amdgpu, and ideally bisect?

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #9 from txtsd <thexerothermicsclerodermoid@gmail.com> ---
Can I do anything to expedite the search here?

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #10 from Andrew Sheldon <asheldon55@gmail.com> ---
Appears to affect the RX550 and Vega 56 as well, with kernel 4.18.8. Most
obvious symptoms are seen when running fullscreen games, with a high recorded
framerate, but FPS feels like it's running at half the rate or less (and
stutters quite a bit). Turning TearFree off works around the issue.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #11 from Andrew Sheldon <asheldon55@gmail.com> ---
I've run some tests using:
https://testufo.com/photo#photo=quebec.jpg&pps=960&pursuit=0&height=0

I've found that with TearFree enabled, there is a stutter every 4-5 seconds.
This occurs at different refresh rates (60hz and 92hz tested). If I turn
TearFree off, no stutter or tearing occurs (the test uses v-sync).

I suspect the bug is related to #106175, since if I turn compton on, the
stuttering becomes severe. So perhaps there is some underlying issue that
affects both TearFree and compositing managers, but not regular v-sync.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #12 from Andrew Sheldon <asheldon55@gmail.com> ---
The bug looks to be due to the new display code. Setting amdgpu.dc=0 removes
all stuttering in the testufo test, with TearFree enabled. Compton still has
stuttering, but that could be a configuration issue, or something to do with
the test itself.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #13 from Andrew Sheldon <asheldon55@gmail.com> ---
I should say that part of the bug seems to be worked around with amdgpu.dc=0 in
that the stuttering is gone. But the other issue, that of the output looking
like it's running at half the framerate in certain games (only with TearFree
enabled), is not.

Perhaps I should open another bug for that issue, though.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #14 from Andrew Sheldon <asheldon55@gmail.com> ---
Okay, so on the secondary issue of the perceived framerate dropping in some
cases, it appears to be related to GPU load. If the GPU usage reaches 100% the
perceived framerate drops dramatically, whereas if I lower settings or
artificially limit the FPS such that 100% usage isn't reached, the degradation
doesn't happen.

Is this expected behaviour? If so, it might be useful to have the ability to
disable the feature for fullscreen windows, much like compositing managers have
the ability to unredirect fullscreen windows.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #15 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Andrew Sheldon from comment #14)
> Is this expected behaviour?

I'm afraid it might be at this point, due to TearFree always incurring an
additional GPU copy.

> If so, it might be useful to have the ability to disable the feature for
> fullscreen windows, much like compositing managers have the ability to
> unredirect fullscreen windows.

Well, it's not quite the same, since even fullscreen windows can tear without
page flipping. But yeah, it's possible to eliminate the additional GPU copy
while a DRI3 client is page flipping, just haven't got around to implementing
it. Anyway, that's a separate issue from the stuttering and should be tracked
in a separate report.

BTW, I don't suppose xf86-video-amdgpu 18.1.0 makes any difference for the
stuttering?

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #16 from Andrew Sheldon <asheldon55@gmail.com> ---
Okay, so it turns out the frame dropping issue only exists for me in a PRIME
configuration. Perhaps the additional GPU copy at full load is too much for the
system to handle, and it starts dropping frames instead. I can workaround it by
limiting the framerate at least, although not all games and GPU APIs allow for
this.

For the main topic of this bug, there are now patches for the stuttering here
https://bugs.freedesktop.org/show_bug.cgi?id=106175 which is likely the same
issue that the OP reported.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #17 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Andrew Sheldon from comment #16)
> Okay, so it turns out the frame dropping issue only exists for me in a PRIME
> configuration. Perhaps the additional GPU copy at full load is too much for
> the system to handle, and it starts dropping frames instead.

Hmm, frame drops should only happen if the GPU connected to the display is
overloaded though. What kind of PRIME configuration is this exactly?

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #18 from Andrew Sheldon <asheldon55@gmail.com> ---
(In reply to Michel Dänzer from comment #17)
> (In reply to Andrew Sheldon from comment #16)
> > Okay, so it turns out the frame dropping issue only exists for me in a PRIME
> > configuration. Perhaps the additional GPU copy at full load is too much for
> > the system to handle, and it starts dropping frames instead.
> 
> Hmm, frame drops should only happen if the GPU connected to the display is
> overloaded though. What kind of PRIME configuration is this exactly?

Update: My mistake. There's a specific place I was testing, and I managed to
reach my refresh rate so it wasn't actually fully loading the card, giving the
impression that PRIME was the cause (rather than the overhead of PRIME
resulting in 100% GPU usage).

Nevertheless, the setup is like this:

RX550 connected directly to display

Vega 56 doing the rendering

I've switched back to the V56 as the primary for now, but I can test again if
needed.

I will say there didn't seem to be significant GPU usage on the RX550 when
connected to the display, even when the frame drop issue was occurring. Which
is interesting considering you were saying that should only occur when the GPU
connected display is overloaded.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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https://bugs.freedesktop.org/show_bug.cgi?id=105530

--- Comment #19 from Tyson Tan <tysontanx@gmail.com> ---
I can confirm the screen stuttering with RX460 and RX550. It doesn't happen
with R7 250E or Firepro W5100 which are GCN2 cards using radeon. Seems to be a
Polaris/AMDGPU specific problem? This issue did not happen on Linux 4.14 if I
recall correctly.

Tested using Manjaro 18.0.2, Linux 4.20.1, Gnome 3.30, KDE Plasma 5.14.

I'm using dual display, Dell U2417H via HDMI, Cintiq Pro 13 via Displayport.
Stuttering happens even when U2417H is disabled using DE's control panel.

amdgpu.dc=0 does not work for me. 

Anything I can do to help with the diagnose, please let me know.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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--- Comment #20 from Haxk20 <haxk612@gmail.com> ---
Same issue on VEGA8 and RX560X PRIME configuration.

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[Bug 105530] Stuttering on Raven Ridge when TearFree is on

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Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #21 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
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