https://bugs.kde.org/show_bug.cgi?id=502390
Bug ID: 502390
Summary: Wrong screen resolution for XWayland clients on
multi-monitor setups with mixed resolution displays
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: xwayland
Assignee: kwin-bugs-n...@kde.org
Reporter: openmind...@gmail.com
Target Milestone: ---
Created attachment 179989
--> https://bugs.kde.org/attachment.cgi?id=179989&action=edit
systemsettings settings
SUMMARY
I noticed a wierd behaviour of XWayland app[s] when certain conditions are met:
1. Wayland Plasma session is running (up to 6.3.4 are affected, dev branch not
tested but should be the same)
2. Legacy applications (X11): "Apply scaling themselves" is selected as a
scaling preference.
3. Have dual or more monitor setup with both monitors having different
resolution. In my case, it's 3072x1920 (laptop) and 1920x1080 (external) ones.
4. XWayland app[s] run on the external monitor have its resilution effectively
doubled then downscaled, resulting in severe fps loss (but looks good).
Selecting native (real) resolution in app's settings makes it run much more
smoothly, but its interface becomes blurred and unavailable (nothing happens
when I click on what is supposed to be an app's button, dropdown menu,
radiobutton, etc).
STEPS TO REPRODUCE
1. Have Wayland, at least 2 monitors with not equal resolution (I guess HiDPI +
a regular FHD will do)
2. Launch XWayland app supposed to work in full-screen mode
3. Scratch your head in wonders
OBSERVED RESULT
App's interface is not responding (unreachable, unclickable)
EXPECTED RESULT
Plasma (KWin or what else is to blame for this) not messing with non-HiDPI
monitor resolution. Let it be the default one. Or launch a separate xwayland
instance for each monitor / process run on such monitor, if possible.
SOFTWARE/OS VERSIONS
Windows: there it works btw
macOS: there be krakens
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma:
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.3
ADDITIONAL INFORMATION
I guess it has already been discussed here:
https://bugs.kde.org/show_bug.cgi?id=459185
Xrandr shows doubled resolution for FHD monitor (DP-1):
$ xrandr
0 (55.686s)
Screen 0: minimum 16 x 16, current 6912 x 2160, maximum 32767 x 32767
eDP-1 connected 3072x1920+0+0 (normal left inverted right x axis y axis) 312mm
x 195mm
3072x1920 119.98*+
2048x1536 119.95
1920x1440 119.97
1600x1200 119.82
1440x1080 119.92
1400x1050 119.90
1280x1024 119.83
1280x960 119.89
1152x864 119.77
1024x768 119.80
800x600 119.85
640x480 119.52
320x240 117.34
2560x1600 119.93
1920x1200 119.90
1680x1050 119.89
1440x900 119.94
1280x800 119.85
1152x720 119.73
960x600 119.74
928x580 119.55
800x500 119.47
768x480 119.71
720x480 119.65
640x400 119.64
320x200 117.55
2880x1620 119.95
2560x1440 120.00
2048x1152 119.96
1920x1080 119.93
1600x900 119.95
1368x768 119.83
1280x720 119.86
1024x576 119.85
864x486 119.69
720x400 119.54
640x350 119.24
DP-1 connected primary 3840x2160+3072+0 (normal left inverted right x axis y
axis) 510mm x 290mm
3840x2160 59.98*+
2048x1536 59.95
1920x1440 59.97
1600x1200 59.87
1440x1080 59.99
1400x1050 59.98
1280x1024 59.89
1280x960 59.94
1152x864 59.96
1024x768 59.92
800x600 59.86
640x480 59.38
320x240 59.29
2560x1600 59.99
1920x1200 59.88
1680x1050 59.95
1440x900 59.89
1280x800 59.81
1152x720 59.97
960x600 59.63
928x580 59.88
800x500 59.50
768x480 59.90
720x480 59.71
640x400 59.95
320x200 58.14
3200x1800 59.96
2880x1620 59.96
2560x1440 59.96
2048x1152 59.90
1920x1080 59.96
1600x900 59.95
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.92
720x400 59.27
640x350 59.28
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