Bug 499992

Summary: UI crashes on alt tab in Kubuntu 24.10 running on a Hyper-V VM
Product: [Plasma] kwin Reporter: Anshul Singh <anshul.singh>
Component: tabboxAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DOWNSTREAM    
Severity: crash    
Priority: NOR    
Version First Reported In: 6.1.5   
Target Milestone: ---   
Platform: Kubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Anshul Singh 2025-02-13 14:53:01 UTC 
SUMMARY
The UI seems to crash whenever I try to switch tasks with alt tab. When I alt-tab and use arrow keys the screen just crashes and goes black for around 4-5 seconds and then I get the switch. In the meantime I can’t see the switcher either. I’m running Kubuntu 24.10 in a Hyper-V VM and I started facing this issue since the 24.10 update, it used to work fine in 24.04.

STEPS TO REPRODUCE
alt-tab and use arrow keys to switch

OBSERVED RESULT
screen goes black and UI crashes(?)

EXPECTED RESULT
I should be able to see and navigate through windows on the task switcher

SOFTWARE/OS VERSIONS
OS: Kubuntu 24.10 x86_64
Host: Virtual Machine Hyper-V UEFI Release v4.1 on Windows 11
Kernel: 6.11.0-14-generic
Shell: zsh 5.9
Resolution: 2560x1440
DE: Plasma 6.1.5
WM: KWin
Theme: Breeze-Dark [GTK2], Breeze [GTK3]
Icons: breeze-dark [GTK2/3]
Terminal: konsole
CPU: Intel i9-14900HX (16) @ 5.133GHz
Memory: 4702MiB / 5957MiB
Comment 1 Bug Janitor Service 2025-02-13 15:33:37 UTC 
Thank you for the bug report!

However Plasma 6.1.5 is no longer eligible for support or maintenance from KDE; supported versions are 5.27. (LTS), and 6.2 (non-LTS) or newer. Please upgrade to a supported version as soon as your distribution makes it available to you. Plasma is a fast-moving project, and bugs in one version are often fixed in the next one.

If you need support for Plasma 6.1.5, please contact your distribution, who bears the responsibility of providing support for older releases that are no longer supported by KDE.

If you can reproduce the issue after upgrading to a supported version, feel free to re-open this bug report.