Hi,
I am facing a common issue with a screen artifacts whenever I start my Xorg on
AMDGPU driver with display set to 75 Hz 1920x1080. It appears to be hitting all
the users of AMDGPU driver.
https://bugs.freedesktop.org/show_bug.cgi?id=96868
https://bugs.freedesktop.org/show_bug.cgi?id=102646
Here I am running the Polaris, RX 580 8G variant.
I've noticed that if I disable freesync *before* starting Xorg, which makes my
Xorg starts with default 60Hz, I have no screen artifacts. If however I start
Xorg with freesync on (in monitor), XOrg defaults to 75 Hz and I have random
screen tearing and artifacts. What is worth a note is that if I enable freesync
and/or change from 60 Hz to 75 Hz after Xorg started, I have no screen
artifacts. Same goes if I switch to 60 Hz via xrandr and/or disable freesync in
Monitor OSD during Xorg run time, the screen artifacts still happen.
Forcing power state to lowest with
echo low >/sys/class/drm/card0/device/power_dpm_force_performance_level
Does make the screen artifacts go away, during runtime, without restart.
I found it a bit surprising that it appears it's about the state of
monitor/default frequency of the moment when Xorg was started rather than the
the currently running frequency of the screen. As with low mode, I Have 300 MHz
on mclk and sclk and no screen artifacts it may mean that it's not about not
enough power on the GPU to handle it, rather than something that happens when
the power states switches.
Some additional information:
- I am running simple openbox WM
- Vanilla 4.19.2 kernel
- x11-drivers/xf86-video-amdgpu-18.1.0
- x11-base/xorg-server-1.20.3
Would you kindly share your thoughts about above problem?
-- Piotr.
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