Like Daniel says, this seems to be a dupe of a bug with xorg not detecting the right resolution, probably because of incorrect sync rates. It'd be helpful to see the files Timo specified, but lacking those, I'm marking this as a dupe.
Like Daniel says, this seems to be a dupe of a bug with xorg not detecting the right resolution, probably because of incorrect sync rates. It'd be helpful to see the files Timo specified, but lacking those, I'm marking this as a dupe.