https://bugs.kde.org/show_bug.cgi?id=409500
Bug ID: 409500
Summary: Multiple second delay between Alt + Tab key press and
actual switching of windows
Product: kwin
Version: 5.15.5
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: tabbox
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 121324
--> https://bugs.kde.org/attachment.cgi?id=121324&action=edit
Screen recording of the issue
SUMMARY
Attempting to Alt + Tab between windows results in a delay of multiple seconds
until the window changes. During this "delay" it is not possible to select any
other applications from the task bar. It seems as though the system is frozen
(accept for mouse movement) until it catches up.
This issue just started happening in the past week after upgrading to kwin
5.15.5-2 from 5.15.5-1
STEPS TO REPRODUCE
1. Open GoLand, Google Chrome, and About System
2. Confirm window switching by clicking task bar
3. Press Alt + Tab
4. Wait, wiggle mouse, pass time
OBSERVED RESULT
System appears to freeze except mouse still functions
EXPECTED RESULT
Windows change
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 30 KDE Spin
(available in About System)
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.59.0
Qt Version: 5.12.4
ADDITIONAL INFORMATION
This may be related to https://bugs.kde.org/show_bug.cgi?id=405103 from my
searching, but I don't know enough to be certain. This bug appears to trigger
on all windows not just the Goland editor.
I've attached a screen recording of the issue. Alt + Tab is pressed at the 9
second mark and the window switching completes at 29 seconds.
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