https://bugs.kde.org/show_bug.cgi?id=472216
Bug ID: 472216
Summary: On a Laptop KScreen picks resolution to match internal
screen aspect ratio for connected external monitors
Classification: Plasma
Product: KScreen
Version: 5.27.4
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
I have a laptop with a 16:10 aspect screen internal screen, This machine is
used with an external 16:9 screen as its primary screen. Every time I boot up
it connects to the monitor with a 16:10 resolution despite the settings being
set for 1920x1080 (a 16:9 aspect). In addition to this the list of supported
resolutions only shows up to the highest 16:10 resolution the monitor supports
(1650x1080 in my case). Making it impossible to select the correct resolution
as not show in the list! In order to see the real list of resolutions I need to
unplug the monitor with KDE running and plug it back in.
This could be related to https://bugs.kde.org/show_bug.cgi?id=469113.
STEPS TO REPRODUCE
1. Use a laptop with 16:10 internal screen.
2. Plugin the monitor, turn on the laptop
3. Set the correct settings for your external monitor. The external should be
in a different aspect ratio then the internal aspect ratio. Disable the
internal screen. Be sure you have save the config for "this specific
arrangement".
4. Reboot
5. Upon reboot check the resolution of the external screen
OBSERVED RESULT
The Saved resolution for the external screen (1920x1080) is not used and
instead a resolution matching the internal aspect is picked. This list of
available resolutions in the display KCM now stops at the highest resolution
that the monitor supports in the aspect ratio of the internal screen.
EXPECTED RESULT
The previously selected resolution is selected for the external monitor and the
full list is shown in the Display KCM for the external devices supported
resolutions.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.27.6
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Additional Information
Laptop Screen Default Resolution: 1920x1200@60hz
External Screen Default Resolution: 1920x1080@75hz
HDMI is used for the connection.
Tested on Wayland and X11
Tested with the laptop open and closed while booting.
During boot the external says its mode is 1920x1080.
If you correct the resolution then log out . The correction will persist until
reboot
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