Bug 506974

Summary:	Mouse Icon and Position Offset in Steam Games With Disabled Monitor
Product:	[Plasma] kwin	Reporter:	Michael Kreitzer <mrgrim>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal
Priority:	NOR
Version First Reported In:	6.4.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Michael Kreitzer 2025-07-13 01:25:15 UTC

I have two monitors both with a single panel at the bottom. When I disable one of them and start a game (may not just be Steam, but that's all I use), the mouse cursor icon draws maybe a centimeter above where the cursor position actually is.

If I alt tab out and click back in, the icon and position match until I click once in the game, then they immediately diverge once more.

Using one older version of Proton I got a slightly different behavior. The icon and position matched, but I could not click on anything on the bottom centimeter or so of the screen.

I do not know if this is a kwin issue, a proton issue, plasma issue, or something else. I wouldn't even know where to start. My guess is that panel on the disabled monitor is still alive in some way and conflicting. This is on Wayland. I tested multiple proton versions and multiple games. Logging out and back in does not resolve the issue.

Re-enabling the second monitor solves the mouse position problems.

The only other detail I can think of is the disabled monitor is in portrait orientation to the right of the primary monitor. Please let me know what more information I can provide.

Comment 1 Michael Kreitzer 2025-07-13 01:27:45 UTC

Oh a few more details I remembered:

Setting the game to regular fullscreen or borderless window fullscreen makes no difference.
Toggling between a hardware or software cursor in the game makes no difference.

I'm not even sure if these matter or do anything in Linux tbh.