With your post here http://forum.ubuntuusers.de/topic/146087/ I really think this is a duplicate.
Try:
Alex Willmer wrote on 2007-10-02: (permalink)
Commenting the line "virtual 1920 1440" and adding "1280x800" to the list of modes has resolved this problem for me. (with your video mode, in the xorg.conf file)
With your post here http:// forum.ubuntuuse rs.de/topic/ 146087/ I really think this is a duplicate.
Try:
Alex Willmer wrote on 2007-10-02: (permalink)
Commenting the line "virtual 1920 1440" and adding "1280x800" to the list of modes has resolved this problem for me. (with your video mode, in the xorg.conf file)