My test laptop did misdetect the Monitor and thus came up with the fbdev driver with 800x600. kdm crashed with that on startup (Perhaps while setting the background picture?) After adjusting the monitor values and having 1024x768 with nm2200 driver it works
This is almost certainly caused by Bug #25029 and not related to the monitor settings. *** This bug has been marked as a duplicate of 25029 ***
(The workaround for that bug is to use the i386 glibc package instead of the i686 one.)