https://bugs.kde.org/show_bug.cgi?id=424995
Bug ID: 424995
Summary: Secondary display resolution lost when attached when
the display is powered-down
Product: kwin
Version: 5.18.5
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: soltesz.and...@gmail.com
Target Milestone: ---
SUMMARY
KDE switches to the lowest possible resolution when a secondary display is
attached but not yet turned on. It never restores the correct resolution when
the displayed is powered up, detached and reattached.
I use a USB-C port replicator with my XPS 9360 laptop and a fullHD display
attached via an HDMI cable to the replicator.
STEPS TO REPRODUCE
1. Attach the USB-c port replicator to the machine with the HDMI cable already
attached but the display itself powered down
2. A new display appears in the Settings > Displays with 480p resolution (DP-1)
but of course cannot be used.
3. Power-up the external display
4. KDE will switch the display to 480p resolution and the displays becomes
usable
5. Detach the port replicator and re-attach it. A proper display name will now
appear in Displays.
OBSERVED RESULT
KDE still keeps the 480p resolution instead of switching to the correct, last
known resolution of the display
EXPECTED RESULT
KDE restores the correct, last-known resolution of the display.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 20.04
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
ADDITIONAL INFORMATION
It is like KDE somehow identifies a virtual display on the port replicator and
handles that instead of the actual display at the other end of the port
replicator.
When the HDMI cable is directly attached, the behaviour is different.
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