Bug 504321

Summary:	"Exclusive" fullscreen Wine games freeze after Alt+Tab → refocusing
Product:	[Plasma] kwin	Reporter:	fililip <team>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	nate, pollux66, team
Priority:	NOR	Keywords:	regression
Version First Reported In:	6.3.90
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:	https://invent.kde.org/plasma/kwin/-/commit/a49dc8e4e7a11677f22d08247a4cb015cee210bd	Version Fixed In:	6.4.0
Sentry Crash Report:

Description fililip 2025-05-16 09:41:27 UTC

SUMMARY
When alt-tabbing out of a Wine game in fullscreen mode, the game auto-minimizes. Upon trying to re-focus its window, it gets brought back but displays a freeze frame and does not update anymore.

This does not happen on Plasma/6.3; everything works as expected prior to 6.4.
It also does not happen with the Wayland driver for Wine.

STEPS TO REPRODUCE
1. Launch a Wine game (I tested both Black Mesa using Proton and Doom 2016)
2. Alt+Tab out of it
3. Attempt to return to it

OBSERVED RESULT
The game freezes

EXPECTED RESULT
The game continues running normally

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.3.90
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.6-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 20 × AMD Ryzen AI 9 365 w/ Radeon 880M
Memory: 32 GiB of RAM (27.2 GiB usable)
Graphics Processor: AMD Radeon Graphics

Comment 1 fililip 2025-05-16 19:55:56 UTC

Bisected to:

0b6decb103b01187d7665cc9942687df1f1ff22f is the first bad commit
commit 0b6decb103b01187d7665cc9942687df1f1ff22f
Author: Xaver Hugl <xaver.hugl@gmail.com>
Date:   Wed Jan 1 22:26:25 2025 +0100

    remove the x11 operation mode, and the x11 standalone backend

Comment 2 Bug Janitor Service 2025-05-17 12:28:16 UTC

A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/7623

Comment 3 Vlad Zahorodnii 2025-05-17 12:49:31 UTC

Git commit ba13665e9ea72da5e52c8d486dc97c9e987498c1 by Vlad Zahorodnii.
Committed on 17/05/2025 at 12:49.
Pushed by vladz into branch 'master'.

Properly unmap minimized and hidden X11 windows

Amends 0b6decb103b01187d7665cc9942687df1f1ff22f.

This is what kwin used to do prior to the split. Video games probably
break because they monitor UnmapNotify events, and with internalKeep()
they never arrive.

M  +2    -2    src/x11window.cpp

https://invent.kde.org/plasma/kwin/-/commit/ba13665e9ea72da5e52c8d486dc97c9e987498c1

Comment 4 Vlad Zahorodnii 2025-05-17 12:51:11 UTC

Git commit a49dc8e4e7a11677f22d08247a4cb015cee210bd by Vlad Zahorodnii.
Committed on 17/05/2025 at 12:50.
Pushed by vladz into branch 'Plasma/6.4'.

Properly unmap minimized and hidden X11 windows

Amends 0b6decb103b01187d7665cc9942687df1f1ff22f.

This is what kwin used to do prior to the split. Video games probably
break because they monitor UnmapNotify events, and with internalKeep()
they never arrive.

(cherry picked from commit ba13665e9ea72da5e52c8d486dc97c9e987498c1)

M  +2    -2    src/x11window.cpp

https://invent.kde.org/plasma/kwin/-/commit/a49dc8e4e7a11677f22d08247a4cb015cee210bd

Comment 5 Vlad Zahorodnii 2025-05-20 08:55:28 UTC

*** Bug 504555 has been marked as a duplicate of this bug. ***