Bug 484971

Summary: Low framerate on external monitor under Wayland
Product: [Plasma] kwin Reporter: kde
Component: wayland-genericAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: xaver.hugl
Priority: NOR    
Version First Reported In: 6.0.3   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description kde 2024-04-03 10:37:17 UTC 
SUMMARY
When using an external monitor, the framerate of KWin is half of what it should be.

STEPS TO REPRODUCE
1. Run session under Wayland

OBSERVED RESULT
mostly 30 FPS (built-in "show FPS" desktop effect in Plasma)

EXPECTED RESULT
60 FPS

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20240329
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.3
Kernel Version: 6.8.1-1-default (64-bit)
Graphics Platform: Wayland
Processors: 8 × AMD Ryzen 5 PRO 3500U w/ Radeon Vega Mobile Gfx
Memory: 14.5 GiB of RAM
Graphics Processor: AMD Radeon Vega 8 Graphics
Manufacturer: LENOVO
Product Name: 20NKS01Y00
System Version: ThinkPad T495

ADDITIONAL INFORMATION
The external monitor is 3840 x 1600 @ 60 Hz
On the internal monitor, everything is perfectly smooth at 1920 x 1080 @ 60 FPS
Comment 1 kde 2024-04-27 20:32:46 UTC 
I noticed that the framerate is normal (60 fps) when the internal laptop screen is ON.

For some reason, using only the external monitor makes the framerate worse...
Comment 2 kde 2024-04-27 20:33:56 UTC 
So to sum up:

internal screen only: OK
internal screen + external screen: OK
external screen only: low FPS
Comment 3 Zamundaaa 2024-06-09 16:58:12 UTC 
Please re-test this in Plasma 6.1 once it's out, it has several performance improvements and render scheduling fixes, which might fix this
Comment 4 Bug Janitor Service 2024-06-24 03:47:18 UTC 
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!
Comment 5 Bug Janitor Service 2024-07-09 03:47:16 UTC 
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

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