[Intel-gfx] [regression] xrandr: cannot find crtc for output eDP1

[Oleksij Rempel (fishor)]

Hallo all,

i get this error if  try to use external monitor with my laptop (Asus 
zenbook ux31e). Usually it is configured automatically or with gui. But 
not it is not working. I got this regression for some weeks after some 
of updates. I assume it was one of xorg/intel driver updates. I use 
ubuntu 12.04,

I tested:
- kernel versions 3.2.0-12-generic, 3.2.0-17-generic and vanilla git 
3.3.0-rc6-00164-g4f262ac.
- X.Org X Server 1.12.0
- xserver-xorg-video-intel i tested default precise version 
2:2.17.0-1ubuntu4 and xorg-edgers version 
2:2.18.0+git20120308.aa7a2bd7-0ubuntu0sarvatt

without any luck :(

suddenly i can't get old working version to "bisect" it.

if i run this command:
xrandr --output eDP1 --auto --output VGA1 --auto --same-as eDP1
i get:
xrandr: cannot find crtc for output eDP1

here is output of xrandr:
xrandr
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
eDP1 connected (normal left inverted right x axis y axis)
    1600x900       60.0 +
    1440x900       59.9
    1360x768       59.8     60.0
    1152x864       60.0
    1024x768       60.0
    800x600        60.3     56.2
    640x480        59.9
VGA1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 
338mm x 270mm
    1280x1024      60.0*+   75.0
    1280x960       60.0
    1152x864       75.0
    1024x768       75.1     70.1     60.0
    832x624        74.6
    800x600        72.2     75.0     60.3     56.2
    640x480        72.8     75.0     66.7     60.0
    720x400        70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)



if you need more info you can find it in my bug report here
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/946311

Thank you for any help

Regards,
Alexey