[Bug 199319] New: Flickering screen on AMDGPU and DC with Linux 4.16-2

[Bug 199319] New: Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

            Bug ID: 199319
           Summary: Flickering screen on AMDGPU and DC with Linux 4.16-2
           Product: Drivers
           Version: 2.5
    Kernel Version: Linux 4.16
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: mail@rainer-finke.de
        Regression: No

Description: I upgraded to Linux 4.16-2 from the Arch Linux testing repository,
but since then the screen is flickering with my RX480 and AMDGPU.DC enabled.
The flickering is visible especially on Plasma-Wayland as soon as I move the
mouse, it is like a bright flickering, not like a graphical corruption. On SDDM
or Plasma X11 the flickering is much less frequent, but even there the screen
flickers from time to time. I use a 4K display connected via DisplayPort.
A downgrade to Linux 4.15 stable solved this even tough AMDGPU.DC is enabled as
well. 
I couldn't reproduce the same issue with my AMD Ryzen 5 2500U Vega APU
(1920x1080), so the issue might be related to the RX480 or 4K.


Additional info:
* Linux 4.16-2 from Arch Linux testing
* AMDGPU.DC=1 (kernel parameter)
* 4K display DisplayPort


Steps to reproduce:
1. Ugrade to Linux 4.16.2 with AMDGPU.DC enabled on a RX480
2. Screen is flickering when moving the mouse

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

Laurent Carlier (lordheavym@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |lordheavym@gmail.com

--- Comment #1 from Laurent Carlier (lordheavym@gmail.com) ---
Same here with RX470 @ 1920x1080 - HDMI

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

Ed Tomlinson (edt@aei.ca) changed:

           What    |Removed                     |Added
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                 CC|                            |edt@aei.ca

--- Comment #2 from Ed Tomlinson (edt@aei.ca) ---
Here too on arch with either mesa 17.3 or 18.0 on 4.16.1-rc with a RX480 4G
HDMI (1920x1200)

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

pmargeti34@gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |pmargeti34@gmail.com

--- Comment #3 from pmargeti34@gmail.com ---
+1

Arch Linux 4.16 with amdgpu.dc=1
MSI Radeon Rx560 4GB -> LG 2560x1080 panel over HDMI

Flickering doesn't happen if Option "TearFree" "true" isn't set in driver's
.conf file or if there is no tearing option ("vsync") selected in KDE system
settings->display and monitor->compositor

Running 4.16 with amdgpu.dc=0 removes flickering.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #4 from Ed Tomlinson (edt@aei.ca) ---
I checked my X conf, no tearfree option is set, using 4.15 I set tearing
prevention to never and rebooted into 4.16.1-rc.  

This does NOT stop the flickering here.

Flicking does not occur with 4.15 dc-1 and does with 4.16.

IMO this is a regression.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #5 from mail@rainer-finke.de ---
Thanks for the hint with vsync, but it didn't change anything for me on
Plasma-Wayland.

At least I noticed, that the bright flickering on my screen on Plasma-Wayland
when moving the mouse appears was due to night shift changing the colours. It
worked well on Linux 4.15. But on Linux 4.16 I need to deactivate it so that
the flickering on Plasma-Wayland during the mouse movements stops.

With night shift and even vsync disabled, there is now just from time to time a
flickering, irregularly.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #6 from mail@rainer-finke.de ---
The flickering that is happening from time to time is probably the same as in
the bug report https://bugzilla.kernel.org/show_bug.cgi?id=199101.

So only the flickering when night shift is enabled on Plasma-Wayland seems to
be different.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

Michel Dänzer (michel@daenzer.net) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com

--- Comment #7 from Michel Dänzer (michel@daenzer.net) ---
Is this the same as bug 199101?

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #8 from mail@rainer-finke.de ---
The random flickering every 30 seconds is the same from my point of view. What
is different on my setup is that Plasma-Wayland with night shift enabled with a
changed color flickers with every mouse movement since Linux 4.16. So the
answer is partially.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

Mike Lothian (mike@fireburn.co.uk) changed:

           What    |Removed                     |Added
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                 CC|                            |mike@fireburn.co.uk

--- Comment #9 from Mike Lothian (mike@fireburn.co.uk) ---
I'm seeing this too, also plasma-wayland but with a PRIME Skylake/Tonga setup
only Skylake is used on the desktop

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #10 from Mike Lothian (mike@fireburn.co.uk) ---
I should add this is 4.16-rc7 (agd5f's 4.18-wip branch) Qt 5.10, KDE frameworks
5.44, Plasma 5.12.4, Xorg 1.19.5 using the modesetting DDX (I'll try the Intel
& AMDGPU DDXs tonight.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

zxvfxwing (zxvfxwing@protonmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |zxvfxwing@protonmail.com

--- Comment #11 from zxvfxwing (zxvfxwing@protonmail.com) ---
Flickering here too: 4.16.0-2-ARCH, RX480, Mesa 18.0.0, x11 (X.Org 1.19.6).

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

haro41@gmx.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |haro41@gmx.de

--- Comment #12 from haro41@gmx.de ---
Same here:

Flickering (as described by 'mail'):
4.16.1, R9 380X, Mesa 18.1.0-devel (git-d899826733), X11(1.19.6)
Tried Gnome and XFCE, similar problems.

This problem doesn't occur with:

- older Kernel (4.15.0)
- 3D Fullscreen (Games)
- older GPU (R9 280X)

Maybe a powerplay related problem, since it only affect newer AMD cards?

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #13 from haro41@gmx.de ---
... have to add:

This problem doesn't occur too with:

- amdgpu.dc=0

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #14 from haro41@gmx.de ---
linux 4.16.1, R9 380X, Mesa 18.1.0-devel (git-d899826733), X11(1.19.6)

with:

amdgpu.dc=0: no flickering, HDMI audio works

amdgpu.dc=1: flickering, HDMI audio not working

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

Márcio (marciosr10@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |marciosr10@gmail.com

--- Comment #15 from Márcio (marciosr10@gmail.com) ---
Same problem here, using linux 4.16.2 on Arch Linux and RX 480 DisplayPort, at
2560 x 1080.

No xorg config set. 

Kernel parameter amdgpu.dc=1

The flickering happens eventualy, but when using nightlight gnome feature it
happens more frequently.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #16 from Harry Wentland (harry.wentland@amd.com) ---
A fix should be in drm-next-4.17 of Alex's git repo at
https://cgit.freedesktop.org/~agd5f/linux/?h=drm-next-4.17 and should make it
into Linus's tree from there.

That fix should also make it into 4.16 stable.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #17 from zxvfxwing (zxvfxwing@protonmail.com) ---
(In reply to Harry Wentland from comment #16)
> A fix should be in drm-next-4.17 of Alex's git repo at
> https://cgit.freedesktop.org/~agd5f/linux/?h=drm-next-4.17 and should make
> it into Linus's tree from there.
> 
> That fix should also make it into 4.16 stable.

Good to know! Thank you.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #18 from haro41@gmx.de ---
@Harry Wentland,
i am trying kernel 4.17.0-rc1 (patches already merged by linus):

With 'amdgpu.dc=1', i get a black screen now at login (perhaps related to this
dc issue). I found 2 new warnings and call traces in kernel log, like:

Apr 18 18:28:41 debian kernel: WARNING: CPU: 10 PID: 345 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dm_services.h:132
generic_reg_update_ex+0x102/0x150 [amdgpu]

...

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #19 from Harry Wentland (harry.wentland@amd.com) ---
@haro41, I recommend opening a new bug if you're seeing a different issue,
unless you have strong reason to believe it's caused by the fixes for the
flickering screen, or otherwise related to it.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #20 from haro41@gmx.de ---
This issues (both, the flickering and the black screen) are obviously fixed
with kernel 4.17.0-rc2. Thank you.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

siyia (eutychios23@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |eutychios23@gmail.com

--- Comment #21 from siyia (eutychios23@gmail.com) ---
Hello i also get screen flickering when running 3d games and massive
performance drop on Xorg with amdgpu.dc enabled.If i add amdgpu.dc=0 to kernel
parameters, Xorgs runs buttery smooth and games do not flicker,my gpu is
polaris RX 550 4gb.

Is there any disadvantage to run the gpu with amdgpu DC off? i use an analog
vga monitor with an active vga to dvi-d converter and i do not plan to use hdmi
in next few years ahead.

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[Bug 199319] Flickering screen on AMDGPU and DC with Linux 4.16-2

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=199319

--- Comment #22 from siyia (eutychios23@gmail.com) ---
Tested both kernels 4.19.x and 4.20rc6

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