dual monitor setup fails (xrandr: Failed to get size of gamma for output default; warning: output LVDS not found; ignoring; warning: output VGA not found; ignoring)

[Dietrich Bollmann <diresu@web.de>]

Hi,

Since a couple of weeks my dual monitor setup fails:

# xrandr --output LVDS --output VGA --right-of LVDS --primary

xrandr: Failed to get size of gamma for output default
warning: output LVDS not found; ignoring
warning: output VGA not found; ignoring

xrand without parameters produces the following output:

# xrandr 

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1280 x 1024, maximum 1280 x 1024
default connected 1280x1024+0+0 0mm x 0mm
   1280x1024       0.0* 
   1024x768        0.0  
   800x600         0.0  
   640x480         0.0  

What can I do?

Thanks, Dietrich

---
I use debian sid on an IBM X60s laptop

# lspci -nn | grep VGA

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile
945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2]
(rev 03)

I erased the /etc/X11/xorg.conf as x windows didn't start anymore and
this was the only way I found to make it start again and get back to
work. Trying after to reconfigure xserver-xorg with
  dpkg-reconfigure xserver-xorg
didn't recreate /etc/X11/xorg.conf. Could this be related?