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. -- You are receiving this mail because: You are watching all bug changes.