I could not find anything odd in XFree86.0.log (not really an X expert though). Since it is 43K I have put it up here in case you would like to have a look: http://www.laimbock.com/dl/x/
The odd: [drm] failed to load kernel module "agpgart"
Linux probably doesn't support your motherboard's AGP port. I wonder if you have a VIA 86XX, like my machine at work:
$ /sbin/lspci 00:00.0 Host bridge: VIA Technologies, Inc. VT8605 [ProSavage PM133] (rev 81) 00:01.0 PCI bridge: VIA Technologies, Inc. VT8605 [PM133 AGP]
Look around for information on hardware driver support before you buy your next motherboard (which is maybe not too far off?)
