Hi Lyude and everyone else, Lyude I'm mailing you about this because you have done a lot of work on DP MST, but if this rings a bell to anyone else feel free to weigh in on this. I'm currently using a Lenovo X1 7th gen + a Lenovo TB3 gen 2 dock as my daily rider for testing purposes. When 5.6-rc1 came out I noticed that only 1 of the 2 1920x1080@60 monitors on the dock lights up. There are no kernel errors in the logs, but mutter/gnome-shell says: gnome-shell[1316]: Failed to post KMS update: Page flip of 93 failed With 93 being the crtc-id of the crtc used for the monitor which is displaying black. Since then I've waited for 5.6-rc3 hoping that a fix was already queued up, but 5.6-rc3 still has this problem. gnome-shell does behave as if all monitors are connected, so the monitor is seen, but we are failing to actually send any frames to it. I've put a log collected with drm.debug=0x104 here: https://fedorapeople.org/~jwrdegoede/drm-debug.log This message stands out as pointing to the likely cause of this problem: [ 3.309061] [drm:intel_dump_pipe_config [i915]] MST master transcoder: <invalid> Regards, Hans _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
