#776356 gdm3 shows only black screen with cursor on tripple head

Package:
gdm3
Source:
gdm3
Description:
GNOME Display Manager
Submitter:
Olliver Schinagl
Date:
2015-01-27 07:51:07 UTC
Severity:
normal
#776356#5
Date:
2015-01-27 07:47:07 UTC
From:
To:
Dear Maintainer,

When booting with 3 monitors, internal laptopscreen, 2 external monitors, GDM
refuses to bring up the login screen, instead it shows 3 black screens with a
cursor. The cursor can happily move between all 3 screens. Booting with only 2
screens, laptop + external monitor, works fine. After logging in, I can happily
plug in the third monitor and have a tripple-head desktop.

Last time I checked on Ubuntu, a few months ago, this all worked normally, so
it has worked at 'some' point in the past.

This on a mid 2013 macbook pro retina,
00:02.0 VGA compatible controller: Intel Corporation Device 0a2e (rev 09)
[    2.598451] fbcon: inteldrmfb (fb0) is primary device
[    3.996610] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
model name: Intel(R) Core(TM) i5-4258U CPU @ 2.40GHz