Re: 5.6 DP-MST regression: 1 of 2 monitors on TB3 (DP-MST) dock no longer light up

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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.

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

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