powerbook VT garbled between rc7 and rc8

Hi,

After upgrading to -rc8 yesterday my powerbook started up today with the
screen totally garbled, only occasionally was a word readable. I also
tried adding radeonfb=accel_cexp to the command line but that changed
nothing. Also, once I was in X, it seemingly worked fine, but then I
opened up a terminal and tried setting the boot volume to 0 (nvsetvol 0)
[I had booted OSX yesterday] and the machine simply shut down and reset
its clock.

Something's amiss, but I have no idea what yet, and don't have time to
further diagnose/bisect before the end of next week.

johannes