https://bugs.kde.org/show_bug.cgi?id=506736
Bug ID: 506736
Summary: task switcher with "Show selected window" freezes
desktop for 1-2 sec when starting and stopping
Classification: Plasma
Product: kwin
Version First 6.3.5
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-tabbox
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
With task switcher "Show selected window" enabled, when pressing Alt+Tab the
whole desktop freezes for 1-2 seconds, then while still holding Alt, pressing
Tab or Shift-tab works as expected, finally releasing Alt to pick the window
freezes the desktop again for another 1-2 seconds. By freezing the desktop I
mean, screen does not refresh, moving the mouse the cursor is still.
STEPS TO REPRODUCE
1. In Task Switcher settings, just enable "Show selected window". The type of
visualization (e.g. Compact) is unchecked.
2. Hold Alt and press Tab
3. Keep holding Alt and press Tab a few more times
4. Release Alt
OBSERVED RESULT
- Screen is frozen 1-2 seconds on first Alt+Tab press. Mouse doesn't move,
screen doesn't update.
- Then we see each window as expected continuing to cycle with more Tab
presses. No lag here.
- When Alt is finally released, the screen is frozen again for 1-2 seconds
before switching to that window.
EXPECTED RESULT
- The desktop should not freeze when pressing Alt+Tab or releasing it
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: arch linux 6.15.2-arch1-1
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
ADDITIONAL INFORMATION
- Wayland session
- RTX 5070 Ti graphics card, nvidia-open drivers
- single 4k monitor with 120Hz refresh rate
This sounds similar but not quite https://bugs.kde.org/show_bug.cgi?id=393139
Trying without "Show selected window" checked, all the Compact, Cover Switch,
... types seem to work fine without any lag.
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