My monitor is LG 24MP59G-P (75Hz, FreeSync) and my GPU is Sapp=
hire Nitro+ RX
480 8GB.
Basically, whenever there is movement on my screen (oddly though, cursor
movement doesn't cause it), it would flicker very badly.=20
Here is a video of what I am talking about: https://streamable.com/5eu7p
Apart from trying different refresh rates, as seen in the video, I have also
tried switching kernel versions, switching from DisplayPort to HDMI, changi=
ng
compositor settings and turning off FreeSync from the monitor OSD, but noth=
ing
seems to resolve the bug.
What works for me as a workaround is changing
/sys/class/drm/card0/device/power_dpm_force_performance_level from auto to
either low or high. When I do watch -n 1
"/sys/class/drm/card0/device/pp_dpm_mclk" with the performance le=
vel on auto,
it normally stays on the lowest (300MHz) and when I move a window around, it
constantly switches from 300MHz to 2000MHz (the max on my GPU). Apparently,
that's what's causing it to behave this way.
I should emphasize, that I observed the bug in Antergos, Debian 9 Buster
(Stretch is good), Manjaro XFCE, Manjaro KDE, Ubuntu 18.10, KUbuntu 18.04 a=
nd
KUbuntu 18.10. At first I thought it was only related to Arch Linux
derivatives, since they all use bleeding-edge packages, but then I noticed,
that after switching Debian 9 Stretch's (stable) sources to Buster (testing)
and after updating KUbuntu 18.10, the bug appeared in both distros as well.
Here is a link to a thread I created in the Manjaro forums, where I asked f=
or
help:
https://forum.manjaro.org/t/manjaro-kde-scree=
n-flickering-cant-seem-to-find-a-solution/78349
- You can find all kinds of different things I tried there, as well as more
in-depth system information.