Bug 506493

Summary:	Fullscreen games move between monitors
Product:	[Plasma] kwin	Reporter:	APTX <marek321>
Component:	multi-screen	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	nate, xaver.hugl
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.4.1
Target Milestone:	---
Platform:	Gentoo Packages
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description APTX 2025-07-02 14:44:21 UTC

SUMMARY
Sometimes fullscreen steam games like Timberborn will move from the display they were opened (also configured the be "primary") on to another display.

STEPS TO REPRODUCE
1. Run a steam game in fullscreen, example: Timberborn
2. I am not sure what exactly causes it, but this is my best guess: Idle (until the screens turns off)

OBSERVED RESULT
The game moves to another display.

EXPECTED RESULT
The game stays on the display it was opened on.

SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.17
KDE Plasma Version: 6.4.1
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.12.31-gentoo-x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 32 × 13th Gen Intel® Core™ i9-13900K
Memory: 128 GiB of RAM (125.4 GiB usable)
Graphics Processor: NVIDIA RTX A4000


ADDITIONAL INFORMATION
It is possible to move the game back to the original display by disabling the other display in "Display Configuration". Annoyingly, the fullscreen game will move to the other display if it is enabled again.

The game keeps running after moving back and forth.

Comment 1 Zamundaaa 2025-10-14 12:42:03 UTC

This is most likely the game just putting the window on the wrong output, after we moved it around because of annoying temporary hotplug events.

I tried to test this and debug it further, but unfortunately Timberborn went completely crazy, continously resizing the window back and forth between two random sizes when I unplugged the screen it was on, so I wouldn't call that a conclusive result.
I also tested with Brotato though, and it correctly went back to the screen it was on originally when I plugged the screen back in.

Can you test with another game and see if that also has the issue? Also, do other (native Wayland) fullscreen windows have the problem?

Comment 2 Bug Janitor Service 2025-10-29 03:47:47 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 2025-11-13 03:47:43 UTC

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