[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

            Bug ID: 105300
           Summary: amd-staging-drm-next-git 4.16 & RX 560 DL-DVI:
                    corruption with refreshrates >73Hz when DPM changing
                    VRAM clock
           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: tempel.julian@gmail.com

Created attachment 137704
  --> https://bugs.freedesktop.org/attachment.cgi?id=137704&action=edit
edids for 2560x1440 73Hz, 74Hz and 75Hz

Hello,
I tried out amd-staging-drm-next-git with Linux 4.16 and my DL-DVI 2560x1440
display:
Now I finally get a picture and refreshrates below 74Hz seem to work without
apparent issues, thanks for fixing the black screen issue!

However, when using edid information which contains a resolution with
refreshrates higher than 73Hz, I get flickering artifacts on the desktop. The
issue disappears when I force full clocks via sysfs or use display timings
which prevent the VRAM from downclocking. So it seems very likely to me that
it's related to downclocking of the VRAM when using higher refreshrates.
This is a regression, the old display stack (amdgpu.dc=0) works with
refreshrates higher than 73Hz and VRAM downclocking at the same time without
issues.

I attached edid files which can be loaded via drm_kms_helper.edid_firmware and
drm.edid_firmware (they show equal behavior in this case), they use LCD
standard timings.

Thanks!

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #1 from Harry Wentland <harry.wentland@amd.com> ---
I wonder if what you're seeing is related to this:
https://bugs.freedesktop.org/show_bug.cgi?id=102646#c22

It's a different ASIC but also does not reproduce when clocks are forced high.

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #2 from tempel.julian@gmail.com ---
I think there are some differences:
The user there described that he would have the issue also with the legacy DC,
which is not the case for me. He also had issues with just 60Hz, which is
definitely not the case for me as well.

To describe my visual corruption a bit closer: It's flashing of various colors
and forms, mostly stripe artifacts. It's quite extreme and makes the system
practically unusable.

My display btw. doesn't have an internal scaler/OSD, DL-DVI input gets straight
to the display panel (if that makes any difference).

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #3 from Harry Wentland <harry.wentland@amd.com> ---
Good point. Do you mind posting a picture of what you're seeing? It often helps
clarify what sort of corruption is happening and helps us understand which part
of the pipeline is messing up.

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #4 from Harry Wentland <harry.wentland@amd.com> ---
Please attach your dmesg, Xorg.0.log and xrandr output.

Are you modifying your monitor's EDIDs to support higher refresh rates?

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #5 from tempel.julian@gmail.com ---
Created attachment 137752
  --> https://bugs.freedesktop.org/attachment.cgi?id=137752&action=edit
dmesg.log

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #6 from tempel.julian@gmail.com ---
Created attachment 137753
  --> https://bugs.freedesktop.org/attachment.cgi?id=137753&action=edit
Xorg.0.log

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #7 from tempel.julian@gmail.com ---
Created attachment 137754
  --> https://bugs.freedesktop.org/attachment.cgi?id=137754&action=edit
xrandr.log

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #8 from tempel.julian@gmail.com ---
Video which shows the artifacts:
https://youtu.be/it3d6BjpZjU
(can also be quite worse when doing stuff)

It happens with every desktop environment with and without enabled OGL
compositor. In the video, it's KDE Plasma on Xorg.
But there is no difference with a Wayland session, the artifacts there are the
same.

You are correct that the display's own edid information doesn't know any other
refreshrate than 59.95Hz.
However, these Korean import display's are very often used with higher
refreshrates because their panels allow this without incompatible scaler in
between. With the old display stack, I can even set 85Hz without any issues.

75Hz is also not very uncommon for some 2560x1440p IPS displays, I suppose
there is the realistic possibility that also displays which have a 2560x1440
75Hz resolution in their original edid are affected by this bug (since the old
stack isn't affected, I'm quite sure it's some kind of bug).

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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https://bugs.freedesktop.org/show_bug.cgi?id=105300

--- Comment #9 from Harry Wentland <harry.wentland@amd.com> ---
Are you messing with TMDS_MAX_PIXEL_CLOCK as Andrew is doing in this ticket:
https://bugs.freedesktop.org/show_bug.cgi?id=105302 ?

With DC clock switching might happen more aggressively which could explain the
underflow you're seeing.

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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--- Comment #10 from tempel.julian@gmail.com ---
I thought of something similar too. But I'm far away from 330Mhz pixel clock.
I'm just using LCD standard timings, which result in a pixel clock of
304.37MHz:
https://abload.de/img/75hzhgs1d.png

I also had the suspicion that the magic 300Mhz mark might be a problem, so I
created a resolution with custom timings for 74Hz which resulted in ~295MHz,
but the issue was still the same. It seems like it's really just about the
refresh rate and not the timings or pixelclock.

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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--- Comment #11 from tempel.julian@gmail.com ---
One of the recent changes in drm-next-4.17-wip has also introduced this issue
for the old legacy DC.

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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--- Comment #12 from tempel.julian@gmail.com ---
Created attachment 139000
  --> https://bugs.freedesktop.org/attachment.cgi?id=139000&action=edit
2560x1440 72Hz edid

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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--- Comment #13 from tempel.julian@gmail.com ---
Since a month back or so, also 73Hz now shows the artifacts. 72Hz is still
artifact free.

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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--- Comment #14 from tempel.julian@gmail.com ---
73Hz + dynamic clocking work again with recent drm-next-4.19-wip build.

As a sidenote: On Windows (which is installed on the same system as a 2nd OS),
there has never been an issue with 75Hz during the last six months.

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[Bug 105300] amd-staging-drm-next-git 4.16 & RX 560 DL-DVI: corruption with refreshrates >73Hz when DPM changing VRAM clock

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--- Comment #15 from tempel.julian@gmail.com ---
Issue still exists with current 4.21-wip kernel.

As a workaround, it's enough to force the highest VRAM clock state (Forcing
higher clocks on the GPU itself is not necessary.):

echo "manual" > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo "2" >  /sys/class/drm/card0/device/pp_dpm_mclk

Odd side note: It doesn't help to overclock the lower VRAM pstates to the same
clocks and voltages as the highest one.

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Alex Deucher <alexdeucher@gmail.com> changed:

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

--- Comment #16 from Alex Deucher <alexdeucher@gmail.com> ---


*** This bug has been marked as a duplicate of bug 102646 ***

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