hi - I almost certainly know the solution to this, the patches that we got from amd to do bandwidth checking in the DP MST helpers don't actually work correctly in a lot of cases and I need to fix them. I've just been busy on PTO and only just got back today, and have been busy with fixing a lot of RHEL stuff at the same time. I'll take a closer look at this soonb On Wed, 2020-02-26 at 16:15 +0100, Hans de Goede wrote: > 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 > -- Cheers, Lyude Paul (she/her) Associate Software Engineer at Red Hat _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
