32bit; I had this for a while during testing but not with recent kernel versions (HP recycled workstation nvidia GT520 graphics), seeing similar on Debian Wheezy with same kernel numbers. I think we sometimes forget the OS is Gnu/Linux and the rest is packaging and customisation (nice though that is).

11.10 I had proper black screen kernel panics on the EeePC netbook, again only during testing.

I might run a live session on 64bit and see what happens.