Bug#253088: radeonfb corruption when killing X from outside X.
I am seing this also, sortof, when i VT switch away from X, and then skill or
stop X in some way, the radeonfb text console is corrupted. When i restart X
blindly, then the console is ok again. When i kill X from inside X, then there
is no problem.
I may have misunderstood the dontswitchvt option, but i feel that forbidding
VT switching is no real option here, but then the option probably does
something more subtle :).
Anyway, i am at your disposition if you need this bug investigated, and may
look into this myself also as time permits.