Bug 514355

Summary:	Tiles layout resetting on portrait mode monitor after system reboot
Product:	[Plasma] kwin	Reporter:	pbuckston
Component:	Quick Tiling	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	REPORTED ---
Severity:	normal	CC:	justin, kde, kdedev, nate
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.4.5
Target Milestone:	---
Platform:	Gentoo Packages
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description pbuckston 2026-01-09 00:59:48 UTC

SUMMARY
I have two monitors connected to my system. One in landscape, one in portrait. After screen and/or system sleep, not every single time, the simple layout of "split top/bottom" is reset on the monitor in portrait mode so that the entire monitor is one large tile zone (without a split).

STEPS TO REPRODUCE
1. Sleep monitors or system.
2. Wake up system and log in.
3. Try to use previous layout to organize windows.

OBSERVED RESULT
Window snaps to and fills entire portrait monitor.

EXPECTED RESULT
Window snaps to and fills either top or bottom tile zone as configured prior to system or display sleep.

SOFTWARE/OS VERSIONS
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: yes
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION
I haven't been able to reliably reproduce the issue, but I suspect the issue coincides with seeing notifications about newly detected monitors after logging back in. This has been an issue going back to at least 6.4.5.

Comment 1 Justin Zobel 2026-01-13 01:57:45 UTC

I just set my tiling zones (Super+T) to top/bottom on one monitor and 3 columns on the other, rotated my screen 90 degrees (keeping the other landscape). Then slept my PC from the lock screen, resumed and unlocked, and the tiling zones were the same. So I can't replicate this issue.

I'm on:
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.21.0
Qt Version: 6.10.1
Kernel Version: 6.17.12-300.fc43.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 32 GiB of RAM (31.3 GiB usable)
Graphics Processor: AMD Radeon RX 7600

Comment 2 pbuckston 2026-01-13 20:31:54 UTC

I found out a way to reliably reproduce the issue, on my system at least: if I reboot, rather than let the displays or system sleep like I previously reported, it resets the layout on the portrait mode monitor every time (four attempts in a row).

Misc note that may be relevant: I'm automatically logging in as my user with session Plasma (Wayland) via SDDM.