[Bug 104054] [SKL][DP] HP Lap Dock external display with DisplayPort over USB Type-C input not properly detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104054

--- Comment #43 from Jérôme de Bretagne <jerome.debretagne at gmail.com> ---
For the first command, I get exactly the same result in all scenarios: without
the external display plugged, with it plugged (but unstable) or with it forced
in low res. Here it is:

   $ sudo intel_reg read 0xc2014
   (0x000c2014): 0x00000006 (display enabled, crt no, lane reversal no, port b
yes, port c yes, port d no)

I'm going to add the results of the 2 other commands as file attachments. When
the external display was plugged but unstable, I took 4 different measures as
doing a quick diff showed quite a few differences depending on the timing. 


PS1. v1 for one file doesn't match the timing of v1 for the other file by the
way, to avoid a possible confusion

PS2. The measure is not simple to do as the built-in panel also blinks while
the system is trying to set the configuration for all screens altogether. I
don't know if that's expected, I would (naively) expect the main screen to
remain configured in its current resolution while only the 2nd is being
configured.

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