Re: successfully install driver,but can't start X,help!!
The file is /etc/modprobe/blacklist.conf
You have to add
to the end.
And make ABSOLUTELY sure you dont have any nvidia packages installed. Also, disable KMS.
Create a /etc/modprobe.d/nouveau.conf and put in it
options nouveau modeset=0
just to be sure.
Prior to installation remove your xorg.conf (or rename it). Let the installer configure it.