[Bug 89271] i915 doesn't enable DP-2 on MacBook 11,1 (Retina, Intel Only, Late 2013)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89271

--- Comment #3 from Regular Guy <figyshki at gmail.com> ---
To add some colour to this report:

When the MacOS boots, both the external screens remain blank, the logo and the
progress bar only appear on the laptop's internal display. The external screens
come alive later. The typical use case is to run the laptop with its lid
closed, and just use the 2 x 27" 2560x1440 monitors - there is a lack of desk
space which forces this particular setup more than anything else. It does help
with the resolution, since the Retina display has a higher resolution than the
27" monitors.


This is similar to what I see happening when Linux loads - initially, I see the
kernel messages on the laptop's internal screen, then (I suspect) the i915
driver loads, takes over the fbcon, and I get a mirror of what is on the Mac's
internal display on one (DP-1) of the two 27" monitors. 

When Xorg starts, I get a spanned screen between the eDP-1 and DP-1. 

I have tried to be clever-ish - 'xrandr --output eDP-1 --off', then 'xrandr
--output DP-2 --auto'.

Am quite willing to play with patches and such.

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