SUMMARY Can't adjust underscan/overscan settings for HDMI-Out in Plasma Wayland session STEPS TO REPRODUCE 1. Use a computer with a TV plugged into the HDMI-Out, TV has no option to 'force' this in its built-in settings 2. Login to Plasma Wayland session 3. No option in Display Configuration settings panel for adjusting overscan/underscan settings OBSERVED RESULT Desktop (in my case) is stretched beyond the TV's physical borders, so bottom panel/top window borders are off screen. EXPECTED RESULT An option to adjust this setting in the Plasma settings and allow my desktop to fill up my TV screen without hanging off the edge SOFTWARE/OS VERSIONS Windows: NA macOS: NA Linux/KDE Plasma: Arch Linux/Kernel 5.9.1-arch1-1 (available in About System) KDE Plasma Version: 5.20.1 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.1 ADDITIONAL INFORMATION With Xorg this can be done easily with xrandr but no such tool exists for doing this in the Wayland session.
Apparently CCBUG doesn't work... I made a patch that allows you to set overscan: https://invent.kde.org/plasma/kwin/-/merge_requests/701 Could you test it? It doesn't include options in UI but should at least make it work if you edit the overscan value in ~/.config/kwinrc.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/846
Git commit 0292c4a74ccce6397fc2347038dd60ec51ff98b1 by Xaver Hugl. Committed on 19/04/2021 at 16:46. Pushed by zamundaaa into branch 'master'. platforms/drm: Add support for setting overscan M +26 -1 src/abstract_wayland_output.cpp M +8 -0 src/abstract_wayland_output.h M +17 -0 src/plugins/platforms/drm/drm_object_connector.cpp M +5 -0 src/plugins/platforms/drm/drm_object_connector.h M +12 -0 src/plugins/platforms/drm/drm_output.cpp M +1 -0 src/plugins/platforms/drm/drm_output.h M +25 -0 src/waylandoutputdevice.cpp M +2 -0 src/waylandoutputdevice.h https://invent.kde.org/plasma/kwin/commit/0292c4a74ccce6397fc2347038dd60ec51ff98b1