https://bugs.kde.org/show_bug.cgi?id=442980
--- Comment #12 from Méven Car <[email protected]> --- (In reply to Tim from comment #9) > Created attachment 142060 [details] > Output of drm_info with monitor plugged in output not working It shows your secondary screens (3840x2160) screen shows up in Plane 8 and CRTC 1 but not in any of its connectors which would be expected for a DisplayPort. Kwin does try to use it but from your ` grep kwin_wayland_drm ~/.local/share/sddm/wayland-session.log ` and it seems at first there is a Connector. ``` kwin_wayland_drm: Reading output configuration for KWin::DrmOutput(0x55abd854c110, name="eDP-1", geometry=QRect(0,0 1920x1080), scale=1) kwin_wayland_drm: Reading output configuration for KWin::DrmOutput(0x55abd85440d0, name="DP-3", geometry=QRect(0,0 3840x2160), scale=1) kwin_wayland_drm: Could not find a fitting mode with size=3840x2160 and refresh rate 23975 for output DP-3 kwin_wayland_drm: Received change event for monitored drm device "/dev/dri/card0" kwin_wayland_drm: Reading output configuration for KWin::DrmOutput(0x55abd854c110, name="eDP-1", geometry=QRect(0,720 1920x1080), scale=1) ``` But it fails to find a mode for the screen (It would be part of its missing corresponding Connector). Then a "change" status event happens for your GPU and the screen is not even seen detected anymore. Adding more logs would help to figure out exactly why, a simple way to add more kwin_wayland_drm output is to edit ~/.config/QtProject/qtlogging.ini and add: ``` [Rules] kwin_wayland_drm.debug=true ``` And exit the session reopen your session, replug you external screen. And resend here the result of grep kwin_wayland_drm ~/.local/share/sddm/wayland-session.log -- You are receiving this mail because: You are watching all bug changes.
