Hi Hans Just commenting in the "[ 3.309061] [drm:intel_dump_pipe_config [i915]] MST master transcoder: <invalid>" message, it is the expected behaviour for anything older than Tigerlake, from TGL+ this will be set in MST mode. On Wed, 2020-02-26 at 18:52 +0100, Hans de Goede wrote: > Hi, > > On 2/26/20 5:05 PM, Alex Deucher wrote: > > On Wed, Feb 26, 2020 at 10:43 AM Hans de Goede <hdegoede@xxxxxxxxxx > > > wrote: > > > Hi, > > > > > > On 2/26/20 4:29 PM, Alex Deucher wrote: > > > > On Wed, Feb 26, 2020 at 10:16 AM Hans de Goede < > > > > hdegoede@xxxxxxxxxx> 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. > > > > > > > > Might be a duplicate of: > > > > https://gitlab.freedesktop.org/drm/amd/issues/1052 > > > > > > Looks like you are right, reverting the commit which the bisect > > > from that issue points to: > > > > > > cd82d82cbc04 ("drm/dp_mst: Add branch bandwidth validation to MST > > > atomic check") > > > > > > Fixes the issue for me. I will add a comment to the issue. > > > > > > Note I'm using integrated Intel gfx, so that means that this > > > issue > > > definitely is not amdgpu specific. > > > > > > > I'm not too familiar with the mst code, but I wonder if we were > > exceeding the bandwidth limits in some setups and it just happened > > to > > work, but now that we enforcing them, they don't which is correct, > > but > > a regression from some users' perspective? > > I seriously doubt that is the case according to: > https://support.lenovo.com/nl/en/solutions/pd029622 > > The gen 2 tb3 dock can handle 2 external > displays at 3840*2160@60Hz together with the internal > panel being on and both my external displays run at > 1920x1080@60 so I'm consuming less then half of the > maximum bandwidth. > > There definitely is a bug somewhere in the > cd82d82cbc04 ("drm/dp_mst: Add branch bandwidth validation to MST > atomic check") > commit (or somewhere else and triggered by that commit). > > Regards, > > Hans > > > > > > > > > Alex > > > > > > > Regards, > > > > > > Hans > > > > > > > > > > > > > > > > > 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 > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
