I have the same problem on the install disks and on the Live CD: The computer locks as soon as the Xserver starts. I end up with a blank screen (color varies) with a moving mouse cursor. Nothing else. Nothing appears on the screen. Keyboard and mouse are inoperative. Even Alt-SysRq-R doesn't work. Only way out is the reset button (or maybe SSH, but I don't have another machine handy to try that from).
I am expecting you to blame in on "upstream", but you can't blame the LiveCD on upstream.
With the LiveCD, I can boot OK by using the VESA driver. The root of the problem seems to lie in the open-source "nv" video driver and my card. The proprietary "nvidia" driver works fine (once it is installed).
With the install disks, I am stuck with a text install (and thus locked out of some of the LVM options I need). I have not found a way to override the autoprobed video driver except to use "noprobe", and I have no idea what drivers I need to install to do the install correctly.
Wish list for fixes:
1. Fix (or update) "nv" driver so it works right with all 6200 cards.
2. Fix the autoprobe so it uses the "vesa" driver for my card (Gigabyte GV-NX62158D<P>).
3. Create option "xdriver=" on install disks, like there is on video disks.
4. Create option "noprobe-video" and let me tell install disk to use VESA driver.
If I can supply any more information to help diagnosis of this mis-probe, I will gladly poke my system if you give me detailed instructions as to what commands to execute. Doing it from the LiveCD-4.4 is probably best and most repeatable.
Ted Miller Elkhart, IN, USA