Comment 18 for bug 13642

I'm also experiencing this bug after upgrading to the latest xserver-xorg
package (6.8.2-7), upon restarting the Xserver my desktop is at 1024x768 which
has a nasty tiling effect on my laptop making it unusable :(

 I upgraded to hoary a number of weeks ago and experienced the problems then
too. In all cases running dpkg-reconfigure xserver-xorg and hitting enter until
it exits (ie. Using the defaults completely) results in a perfectly working
configuration at 1400x1050.

Hardware is an IBM T42 Laptop

ddcprobe output:

vbe: VESA 2.0 detected.
oem: ATI MOBILITY RADEON 9600
memory: 65472kb
mode: 320x200x32k
mode: 320x200x64k
mode: 320x200x16m
mode: 1600x1200x256
mode: 640x400x256
mode: 640x480x256
mode: 640x480x32k
mode: 640x480x64k
mode: 640x480x16m
mode: 1600x1200x32k
mode: 800x600x256
mode: 800x600x32k
mode: 800x600x64k
mode: 800x600x16m
mode: 1600x1200x64k
mode: 1024x768x256
mode: 1024x768x32k
mode: 1024x768x64k
mode: 1024x768x16m
mode: 1280x1024x256
mode: 1280x1024x32k
mode: 1280x1024x64k
mode: 1280x1024x16m
edidfail

matt@neon ~ $ sudo xresprobe dummy
id:
res:
freq:
disptype: lcd/lvds

Hope this helps