[Bug 80532] [BYT] internal display unusable if second display is connected, port not ready error

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80532

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

           What    |Removed                     |Added
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             Status|REOPENED                    |NEEDINFO

--- Comment #11 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to fcbug from comment #10)
> This bug is worse since kernel 3.18.5.
> 
> The system is unusable without an external monitor.
> The internal monitor stays black and switching to a tty seems to be
> impossible.

I'm confused, let's verify some things.

Plugging in an external display brings black screen to internal screen. This is
the bug, right?

Please provide a fresh dmesg with drm.debug=14 module parameter set for 3.18.5,
or preferrably later kernel, reproducing the problem.

Does it make a difference if the external screen is already plugged at boot vs.
plugged later on?

Does the internal display work all right if *no* other displays are connected?

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