[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

            Bug ID: 106446
           Summary: Stutter at higher refresh rates ( 75 Hz) and artifacts
                    on desktop
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: mike@exophase.com

Created attachment 139436
  --> https://bugs.freedesktop.org/attachment.cgi?id=139436&action=edit
Xorg log

I've noticed that moving around windows and scrolling seems to stutter when
running at 75 Hz on my monitor. When moving back down to 60 Hz it is completely
smooth. In fact, 60 Hz looks smoother, while 75 looks like it is skipping
frames.

In Windows however it is completely smooth at 75 Hz. This occurs on a Radeon
Pro WX 7100.

The other thing I noticed... is that when I run at 75 Hz I get artifacts all
over the desktop, which show up as flashing blue lines. This behavior is
exhibited on all AMD GPUs I own (also tested with a RX Vega 64), so it's not a
faulty card. I found that it is fixed by forcing the performance profile to
high, like so:

echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level

I attached my Xorg log. I'm running the 4.16.6 kernel. Full specs:

Threadripper 1950X
64GB RAM
WX 7100
LG 38UC99 monitor

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

--- Comment #1 from Mike Bendel <mike@exophase.com> ---
Something else that may be of note:

Setting amdgpu.dc to 0 sort of fixes the stutter and general performance issues
I'm seeing. Also there is no flickering/artifacts after a fresh boot, without
touching the performance level setting. It isn't 100% though, after some time
the desktop will start stuttering again when moving windows around. But right
after a fresh boot, or switching resolutions, it is completely smooth, as it
should be. In this mode however I notice the cursor skips frames. With
amdgpu.dc=1 the cursor never skips frames.

All in all, neither mode is usable for me and I've resorted to using HDMI on my
monitor which locks the refresh at 60 Hz.

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
This could be at least somewhat related to bug 106175. There seems to be a bad
interaction between HW cursor movement and page flips with DC.

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

--- Comment #3 from tempel.julian@gmail.com ---
Maybe the artifacts with 75Hz are related to my problem I have with 75Hz WQHD
via DL-DVI?
https://bugs.freedesktop.org/show_bug.cgi?id=105300

However, with 72Hz and amdgpu.dc=0, my desktop is always 100% free of stutter 
artifacts (without heavy load on CPU and GPU) with my RX 560.

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

--- Comment #4 from Mike Bendel <mike@exophase.com> ---
tempel.julian:

Yeah I think the artifacts I'm getting 75 Hz are related. I tried creating a
custom resolution @ 70 Hz and the artifacts went away completely without having
to change the performance profile setting.

The window stutter seems to be something else. I tried the PageFlip setting to
false as mentioned in another thread but that did not fix it for me. At 70 Hz
there's less stutter too though, not as noticeable as it is at 75. 

It might be something to do with the monitor. I read in a review that the
38UC99 frameskips even in Windows when FreeSync is OFF. So could the issue be
that Linuux doesn't have full FreeSync support yet?

I tested in Windows with FreeSync off, and it does stutter in a  similar way.
Although, the cursor also stutters. The cursor doesn't stutter at all in Linux,
as long as FreeSync is ON, so it does seem to be doing something. I'm not sure
how to really debug this further though.

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

--- Comment #5 from Mike Bendel <mike@exophase.com> ---
Created attachment 140058
  --> https://bugs.freedesktop.org/attachment.cgi?id=140058&action=edit
dmesg

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

--- Comment #6 from Justin Mitzel <katoflip@protonmail.com> ---
Have you tried using the amdgpu.dpm=1 kernel command? It's worked for me with
my 390X.

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

--- Comment #7 from Mike Bendel <mike@exophase.com> ---
Adding amdgpu.dpm=1 did not fix it, unfortunately. Noticed no change on my
WX7100. Thanks for the suggestion though.

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=106446

--- Comment #8 from Mike Bendel <mike@exophase.com> ---
Did some more testing, this time with a Nvidia card to see if the issues
occurred there and with a different DE.

I now think the stuttering I'm experiencing is purely a Gnome issue. I gave KDE
a try and 75 Hz is completely smooth, just like in Windows. I also tried the
1080 Ti in Gnome and it had the same stuttering my WX7100 and Vega 64 have.

The artifacts definitely seem to be AMDGPU related though. The 1080 Ti doesn't
artifact at all when running at 75 Hz.

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[Bug 106446] Stutter at higher refresh rates ( 75 Hz) and artifacts on desktop

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

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

--- Comment #9 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/378.

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