Bug 478402

Summary: Mouse cursor lag especially under load
Product: [Plasma] kwin Reporter: ledo.kane
Component: compositingAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal CC: xaver.hugl
Priority: NOR    
Version: 5.27.5   
Target Milestone: ---   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description ledo.kane 2023-12-11 16:17:19 UTC 
SUMMARY
The mouse cursor is laggy especially if the gpu is under moderate load. Sometimes while the cursor is passing in between different app windows, there is a stutter that is noticable. As the load on the gpu is increased, the mouse cursor becomes less responsive and the lag becomes much more noticable, up to the point where you need to actually wrestle with your mouse to get the cursor to wherever you want it to be.

STEPS TO REPRODUCE
1. Open some graphical apps. (can be as simple as a web-browser or a video player)
2. Play a video or go to a graphical web page with some animations and stuff.
3. Move your mouse.

OBSERVED RESULT
Mouse cursor lags and stutters as you move your mouse.

EXPECTED RESULT
Mouse cursor should always be fluid and responsive to the mouse inputs.

SOFTWARE/OS VERSIONS
Platform: Raspberry Pi 5
Linux/KDE Plasma: Raspberry Pi OS Lite (bookworm) with KDE Plasma desktop installed on top of it.
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Comment 1 Zamundaaa 2023-12-11 16:41:00 UTC 

*** This bug has been marked as a duplicate of bug 472663 ***
Comment 2 ledo.kane 2023-12-11 17:24:45 UTC 
(In reply to Zamundaaa from comment #1)
> 
> *** This bug has been marked as a duplicate of bug 472663 ***

If this bug is the duplicate of a "resolved" bug, then why am i still experiencing it?
Comment 3 Zamundaaa 2023-12-11 17:42:48 UTC 
Because you're on 5.27, and this is fixed in Plasma 6
Comment 4 ledo.kane 2023-12-11 17:45:25 UTC 
(In reply to Zamundaaa from comment #3)
> Because you're on 5.27, and this is fixed in Plasma 6

I am guessing Plasma 6 is not released yet. Will we (i mean Raspberry Pi users) get an update once it is released. We can get our hands to anything in the debian official repos basically. So once Debian gets it, we will be able to get it too i guess.
Comment 5 Zamundaaa 2023-12-11 18:25:01 UTC 
yes, it's not out yet. It'll be released end of February next year
Comment 6 ledo.kane 2023-12-11 18:27:47 UTC 
(In reply to Zamundaaa from comment #5)
> yes, it's not out yet. It'll be released end of February next year

Thanks for the info.