Hello…I have a Lenovo X1 carbon connected to a Dell WD15 dock with 2 monitors, keyboard and mouse. Currently running Fedora 40. In plasma 5.x when I closed the lid to the laptop it disabled the laptop screen but left the (2) monitors active. In 6.x when I close the lid the laptop screen still stays on and active. This functionality works perfectly in GNOME X11 and Wayland. If it am NOT docked and plug an external monitor into the HDMI port it works as expected. See below the results of journalctl -f.
Thanks for any feedback or if you need additional files to debug.
Jun 21 15:53:56 cedge1 kwin_wayland[2624]: kwin_wayland_drm: disabling connector “HDMI-A-1-unknown” without a crtc
Jun 21 15:53:56 cedge1 kwin_wayland[2624]: kwin_wayland_drm: disabling connector “DP-2-unknown” without a crtc
Jun 21 15:53:56 cedge1 kwin_wayland[2624]: kwin_wayland_drm: disabling connector “DP-4-unknown” without a crtc
Jun 21 15:53:56 cedge1 org_kde_powerdevil[2818]: org.kde.powerdevil: Lid action was suppressed because an external monitor is present
Jun 21 15:53:56 cedge1 tailscaled[1823]: Accept: TCP{100.80.14.124:36274 > 100.121.53.121:33251} 52 ok out
Jun 21 15:53:59 cedge1 systemd-logind[1624]: Lid opened.
Jun 21 15:53:59 cedge1 kwin_wayland[2624]: kwin_wayland_drm: disabling connector “DP-1-unknown” without a crtc
Jun 21 15:53:59 cedge1 kwin_wayland[2624]: kwin_wayland_drm: disabling connector “HDMI-A-1-unknown” without a crtc
Jun 21 15:53:59 cedge1 kwin_wayland[2624]: kwin_wayland_drm: disabling connector “DP-2-unknown” without a crtc
Jun 21 15:53:59 cedge1 kwin_wayland[2624]: kwin_wayland_drm: disabling connector “DP-4-unknown” without a crtc