x problem after upgrading

[Martin Smith]

I upgraded from 6.1 to 6.2 and I am sure I carried out all the necessary 
things that were printed out after it ran, but on attempting to start x 
I get the following

uvm_fault(0xd0c544dc, 0xd3a2d000,  0, 1)->e
kernel: page fault trap, code=0

stopped at I915_gem_pwrite_ioctl+0x621:  mov1  0x34(%eax), %eax

ddb>

(all copied out by hand)

and its locked solid, no response to keyboard at all

I must have missed something, can amyone point me in the right 
direction, thanks

--

Martin