FWIW, I've had this problem on two systems recently, one that was updated, another fresh install. I don't remember what I did to get around it the first time, but on the fresh install system I used this patch and it was indeed able to write the xorg.conf.
thanks, tim -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]