Bug 461455

Summary:	Whole screen flickering under xorg with high refresh rate (144Hz, 165 Hz etc.) with compositing enabled
Product:	[Plasma] kwin	Reporter:	blood990
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	major	CC:	kdedev, nate
Priority:	NOR
Version First Reported In:	5.24.6
Target Milestone:	---
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description blood990 2022-11-05 12:44:35 UTC

SUMMARY

I opened settings. When I swapped from default 60 Hz screen refresh rate to higher one that my monitor supports - frequent screen flickering started to happen until i changed back to 60 Hz or I turned off compositing. Some internet "solutions" like setting fps manually in kwinrc file under [Compositing] section didn't do anything useful so I reverted them. Changing some compositing options didn't help either.

STEPS TO REPRODUCE
1. With my hardware - in kubuntu LTS just set 144 Hz / 165 Hz screen refresh rating

OBSERVED RESULT

Screen flickering similar to the one in this video https://www.youtube.com/watch?v=Tlq5rEf5fO4 but with blank white color covering whole screen everytime it flickers. Frequency of flickering varies but is high - from twice per 5 seconds to once per minute. Goes away if I disable compositing with shift+alt+f12. On wayland it works well, but it seems there is very rare flicker once per few hours, though I am unsure.

EXPECTED RESULT

No screen flickering

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 22.04
KDE Plasma Version: 5.24.6
KDE Frameworks Version: 5.92.0
Qt Version: 5.15.3
Kernel Version: 5.15.0-52-generic (64-bit)
Graphics Platform: X11
Processors: 24 × AMD Ryzen 9 7900X 12-Core Processor
Memory: 31.1 GiB of RAM
Graphics Processor: AMD SIENNA_CICHLID

ADDITIONAL INFORMATION
My monitor is Gigabyte M27Q-P. My GPU is AMD RX 6950 XT, which isn't optimally supported by my kernel. Since I'm linux beginner I do not wanna mess with testing newer kernels. Monitor is connected via displayport connector to the GPU.

Comment 1 TraceyC 2025-01-30 22:55:49 UTC

Thank you for the bug report. Unfortunately we were not able to get to it yet. Can we ask you to please check if this is still an issue with either Plasma 5.27.12 (the current LTS version) or Plasma 6.2.5 (the latest released version)?

I wasn't able to replicate the flickering on Plasma 6.2.5 with a laptop connected to a 3440p monitor at 144Hz

If you can still reproduce the bug, please change the Status to "CONFIRMED". Thanks.

Comment 2 Bug Janitor Service 2025-02-14 03:46:38 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 3 Bug Janitor Service 2025-03-01 03:46:47 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.