I believe i'm having an issue similar to this so let me add some details.
After it loads before it gets to the screen where you can "startx" the monitor goes black. If you wait long enough the following prints itself on your screen.
[ 183.523721] general protection fault: 0000 [#1] SMP
[ 183.524751] last sysfs file: /sys/devices/pci0000:00/0000:00:1c.1/0000:02:00:0/irq
[ 183.526326] CPU 0
[ 183.526326] Modules linked in: dm_crypt snd_hda_codec_hdmi snd BLAH BLAH to much here to type, just lots of stuff
Then it goes on to list the Pid RIP RSP RAX RDX RBP R10 R13 FS CS CRZ DR0 DR3 and then a whole lot of F's and stuff. please help!