https://bugs.kde.org/show_bug.cgi?id=454639
Bug ID: 454639
Summary: amdgpu driver: Flickering in Wayland session after
suspend without lock screen enabled
Product: kwin
Version: 5.24.5
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: jan.rathm...@gmx.de
Target Milestone: ---
Flags: Wayland+
Created attachment 149345
--> https://bugs.kde.org/attachment.cgi?id=149345&action=edit
Video showing the flickering
This is a follow-up report to https://bugs.kde.org/show_bug.cgi?id=447705
Steps how I experience the bug:
* Use Plasma Wayland session, screenlocking disabled, GPU driver set to amdgpu
(see below)
* Do Suspend-to-RAM.
* Resume.
Result:
Sometimes heavy flickering of the whole screen, it goes away if I click on UI
elements (see attached video).
Happens always?:
No. At the first resumes after boot chances are good that everythings's fine.
But when flickering has happend one time, it seems it will also flicker on all
subsequent resumes (until rebooting).
(I rarely see a similar flickering in Firefox at Firefox startup or when a new
browser tab loads [usually only a small square part of the window is affected,
it goes away almost immediately <1 second. Not sure if it is related.].)
Additional notes:
Kubuntu 22.04 + Backports-PPA
Plasma 5.24.5
Frameworks: 5.94.0
Qt: 5.15.3
Kernel: 5.15.0-33-generic
== My system ==
Board: Gigabyte P35-DS3
CPU: Intel Core2Quad Q9550
Graphics card: Asus Radeon R7 240
Note that my graphics card can work with two different drivers:
The default driver is radeon but amdgpu also works by manually enabling it by
adding the following boot optionts to the linux command line in Grub:
radeon.si_support=0 radeon.cik_support=0 amdgpu.si_support=1
amdgpu.cik_support=1
For at least a year(?) I solely used amdgpu on my system (the initial reason
was something like amdgpu worked slightly better than radeon at one minor
aspect, but I don't remember exactly anymore). Using amdgpu was so ubiquitous
for me that I didn't even remember it when writing the original bug report.
For debugging purpose I tested how suspend/resume behaves with radeon driver in
use (both on Wayland and X11), and it is different:
Resume from suspend under Wayland:
* amdgpu: flickers sometimes, as described above.
* radeon: no flickering, but even worse: graphics output completely distorted
and corrupted (see attached video). Sometimes temporarily switching between
different TTYs (Ctrl+Alt+F1-7) restores the desktop, when it does not it
effectively crashes the whole session.
Resume from suspend under X11:
* Everything fine, no flicker (amdgpu), no corruption (radeon)
I also tested (under Wayland) what happens if the lock screen is enabled after
suspend:
* amdgpu: Everythings fine now, couldn't reproduce the flickering anymore
* radeon: corrupted screen, as described above
Sorry it took so long to report this follow-up report, it took some time to
investigate and test all those different subtly different surrounding
conditions.
Kind regards, Jan
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