Maybe boot a bt4-pre-final and compare the output of x-org in that version to the new one and see what has changed. Also, you might try to run the xorg conf and create a new file for your system instead of using the one shipped with this release:
If the auto configuration above doesnt work try and edit what you want to change manually in the xorg.conf file and maybe compare to what you had in settings for the previous release that worked.Code:X -configure


