[Bug 107980] (Tiled) MST display Dell UP3214Q only initialized very late

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107980

--- Comment #3 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
The first modeset happens at ~18 seconds. i915 probe started at ~17 seconds. So
doens't look like probe being slow is the issue here.

I suspect the problem is these guys:
[   18.297317] [drm:drm_dp_dpcd_write_payload.isra.11 [drm_kms_helper]] status
not set after read payload table status 0

So the display itself is maybe in some wonky state after the BIOS manhandled
it. After the replug (at ~67 seconds) the display responds correctly to our
gentle prodding and that error is no longer visible.

I think this may be due to the BIOS doing something odd, or it may have
something to do with the fact that we don't have readout code for MST so we may
not be shutting things down properly when taking over.

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