[Bug 67311] Display on Displayport does not work if plugged in at boot time

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=67311

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #1 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Philip Langdale from comment #0)
> I'm running on a new Intel NUC d54250wyk.
> 
> If I boot the system with my Dell U3011 plugged in, I see a blank screen
> instead of X. Switching to a console VT looks fine, and then trying to
> switch back to X results in me seeing the desktop for a second, then the
> picture starts flickering and goes blank.
> 
> The following scenarios work fine:
> 
> 1) I plug in my U2410 over HDMI and boot with that
> 2) I boot with no display attached and then plug in the U3011
> 3) I run with the U2410, then suspend, then resume with the U3011 plugged in.
> 
> So it seems very specific to this case of booting with the display present.

Please attach dmesgs from early boot, with drm.debug=0xe module parameter set,
for both the reported problem *and* the working case #2. Thanks.

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