[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109359

            Bug ID: 109359
           Summary: Flickering and artifacts on dual 4K displays from RX
                    570
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: venemo@msn.com

There are two Dell U2718Q 4K monitors connected to a Sapphire Pulse RX 570 ITX
card, one using the DisplayPort output and the other using the HDMI output.

There is a visible flickering artifact on both displays. There is no problem
when only a single display is connected.

Searching online yields a couple of results that suggest a workaround: manually
increasing the shader and/or memory clock of the GPU. On the RX 570 the
following commands can get rid of the problem:

echo "manual" > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo "2" > /sys/class/drm/card0/device/pp_dpm_mclk
echo "5 6 7" > /sys/class/drm/card0/device/pp_dpm_sclk

However, I believe the amdgpu driver should be able to figure out the correct
necessary clock settings on its own. The problem exists in Linux 4.19 and
5.0-rc1 as well.

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[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

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https://bugs.freedesktop.org/show_bug.cgi?id=109359

Alex Deucher <alexdeucher@gmail.com> changed:

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

--- Comment #1 from Alex Deucher <alexdeucher@gmail.com> ---
Please attach your dmesg output and xorg log (if using X).

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[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

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https://bugs.freedesktop.org/show_bug.cgi?id=109359

--- Comment #2 from Timur Kristóf <venemo@msn.com> ---
Created attachment 143126
  --> https://bugs.freedesktop.org/attachment.cgi?id=143126&action=edit
dmesg log

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[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

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https://bugs.freedesktop.org/show_bug.cgi?id=109359

--- Comment #3 from Timur Kristóf <venemo@msn.com> ---
Created attachment 143127
  --> https://bugs.freedesktop.org/attachment.cgi?id=143127&action=edit
xorg log

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[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

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https://bugs.freedesktop.org/show_bug.cgi?id=109359

--- Comment #4 from keziolio123@gmail.com ---
I have the same issue with an RX480 if i set amdgpu.ppfeaturemask=0xffffffff
(for overclocking), without any command line changes there is no flickering

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[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

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https://bugs.freedesktop.org/show_bug.cgi?id=109359

--- Comment #5 from Timur Kristóf <venemo@msn.com> ---
(In reply to keziolio123 from comment #4)
> I have the same issue with an RX480 if i set amdgpu.ppfeaturemask=0xffffffff
> (for overclocking), without any command line changes there is no flickering

That's because when you overclock, your clock speed gets high enough so that
flickering doesn't happen.

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[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

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https://bugs.freedesktop.org/show_bug.cgi?id=109359

--- Comment #6 from Timur Kristóf <venemo@msn.com> ---
I forgot about this bug. Looks like I misunderstood keziolio's last comment.
Yes, I can confirm that the problem is not present when amdgpu.ppfeaturemask is
not set on the kernel command line.

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[Bug 109359] Flickering and artifacts on dual 4K displays from RX 570

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https://bugs.freedesktop.org/show_bug.cgi?id=109359

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

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

--- Comment #7 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
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/672.

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