Bug 476686

Summary:	On Wayland, using keyboard on lockscreen activates and focuses the screen locker UI on the non-primary monitor
Product:	[Plasma] plasmashell	Reporter:	giuseppe.termerissa
Component:	Screen locking	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	minor	CC:	fanzhuyifan, nate
Priority:	NOR	Keywords:	multiscreen, wayland-only
Version First Reported In:	6.2.4
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description giuseppe.termerissa 2023-11-07 17:40:52 UTC

SUMMARY

Using the keyboard while on the lock screen triggers the "wrong" monitor, which is a monitor that is not set as primary on my Plasma installation.

STEPS TO REPRODUCE

1. Lock the screen
2. Press a button on the keyboard
3. The triggered lock screen is not the correct one, independently of pointer location

OBSERVED RESULT

The lock screen is correctly triggered when tapping on the keyboard, showing the password prompt. However, this happens on a monitor that is not set as primary on Plasma. Changing which monitor is set as primary changes nothing at all, which makes me think that this might be up to some X11 leftover. I can reproduce this same behavior on SDDM (I imagine that this makes sense since afaik monitors on Wayland are handled by KWin?). None of this happens on an X11 session.

EXPECTED RESULT
I expect the triggered lock screen to either 1. be the one belonging to the primary monitor, or 2. be the one containing the mouse pointer.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 38
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.110.0
Qt Version: 5.15.11
Kernel Version: 6.5.9-200.fc38.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: AMD Radeon RX 580 Series
Manufacturer: Micro-Star International Co., Ltd
Product Name: MS-7C02
System Version: 1.0

ADDITIONAL INFORMATION
One monitor is an LG Ultragear (set at 144hz) while the other is a Samsung S22B150 (60hz). This only happens on Wayland and I'm not able to reproduce it on X11.

Comment 1 Nate Graham 2023-11-09 20:29:01 UTC

Can reproduce in Plasma 6 too.

Comment 2 fanzhuyifan 2025-01-24 03:30:25 UTC

Currently kscreenlocker has code to give focus to the UI on the screen with mouse; upstream Qt bug https://bugreports.qt.io/browse/QTBUG-133204 causes the wrong cursor position to be returned.