Because I am phenomenally lazy: could you attach:
* output from the "xrandr" command from x11-xserver-utils on the
affected setup
* a kernel log with drm.debug=0x6, Xorg.0.log, and xrandr output
using the 2.6.32.y-based kernel from squeeze (it should run fine on
wheezy), for comparison?
Attachment:
dmesg_2.6.32
Description: Binary data
Attachment:
Xorg.0.log_2.6.32
Description: Binary data
Attachment:
xrandr_2.6.32
Description: Binary data
Attachment:
xrandr_3.2.0
Description: Binary data