https://bugs.kde.org/show_bug.cgi?id=474681
Bug ID: 474681
Summary: SDDM kwin_wayland ignores set screen resolution
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Neon
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: tagwer...@innerjoin.org
Target Milestone: ---
SUMMARY:
SDDM presents a 1024/768 logon screen on KVM guests (when set to use
Wayland),
ignoring any previously chosen screen size.
After logon, Plasma uses the size set in System Settings > Display and
Monitor.
Originally encountered in Fedora38:
https://bugzilla.redhat.com/show_bug.cgi?id=2196435
but can be reproduced in Neon Unstable
STEPS TO REPRODUCE:
Switch SDDM to use Wayland by copying:
[General]
DisplayServer=wayland
GreeterEnvironment=QT_WAYLAND_SHELL_INTEGRATION=layer-shell
InputMethod=
[Wayland]
CompositorCommand=kwin_wayland --no-global-shortcuts --no-lockscreen
--inputmethod maliit-keyboard --locale1
as given in
https://bugzilla.redhat.com/show_bug.cgi?id=2196435#c1
into
/etc/sddm.conf
Configure your chosen screen size, logout or reboot....
OBSERVED RESULTS:
You get a 1024/768 size SDDM logon screen.
(It does not seem to matter whether you are using QXL or Virtio video
or whether you select an X11 or Wayland session.)
EXPECTED RESULTS:
Depends.
In a simple case with a single screen, setting the screen size in
System Settings > Display and Monitor should set the size SDDM uses.
Manually adding width and height to the CompositorCommand
CompositorCommand=kwin_wayland --no-global-shortcuts --no-lockscreen
--inputmethod maliit-keyboard --locale1 --width 1440 --height 900
should (probably?) act as a workround.
SOFTWARE/OS VERSIONS
Neon Unstable
Plasma: 5.27.80
Frameworks: 5.240.0
Qt: 6.6.0
ADDITIONAL INFORMATION
With X11, you can set the preferred mode manually by creating a
/etc/share/X11/xorg.conf.d/50-monitor.conf
containing:
Section "Monitor"
Identifier "Virtual-0"
Option "PreferredMode" "1440x900"
EndSection
Section "Monitor"
Identifier "Virtual-1"
Option "PreferredMode" "1440x900"
EndSection
If you are using QXL video, then SDDM picks up the "Virtual-0" config,
if Virtio then the "Virtual-1" one (although this may be shown as "Red Hat,
Inc. QEMU Monitor" under System Settings > Display and Monitor)
Ref: https://bugs.kde.org/show_bug.cgi?id=420169#c8
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