https://bugs.kde.org/show_bug.cgi?id=422141
Bug ID: 422141
Summary: kwin_wayland nested does not allow scale < 1
Product: kwin
Version: 5.17.5
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: t...@r.je
Target Milestone: ---
SUMMARY
When running kwin_wayland nested, it does not support a command line argument
--scale of < 1
STEPS TO REPRODUCE
1. Follow the instructions here:
https://community.kde.org/KWin/Wayland#Starting_a_nested_KWin for a nested
wayland instance
2. Set the command line switch --scale to a value less than 1 e.g. 0.5
OBSERVED RESULT
FATAL ERROR incorrect value for scale
EXPECTED RESULT
Should allow a scale of < 1. E.g. 0.5 (50%)
When using an existing session and using the display configuration it's
possible to set a scale of 0.5 so this seems to be a redundant check at
startup:
The error message comes from main_wayland.cpp:612
https://github.com/KDE/kwin/blob/master/main_wayland.cpp#L612
Use case:
I have an older game that doesn't support MSAA and was trying to render it at a
higher resolution and scale it down, a bit like how DSR works in the windows
nvidia driver.
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