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
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