https://bugzilla.kernel.org/show_bug.cgi?id=34772
--- Comment #1 from Rogério Brito rbrito@ime.usp.br 2011-05-19 20:34:40 --- Just for the record, I can provide further messages of these: this is as reproducible as I like.
In fact, I am now able to reproduce it with kernel 2.6.38 if I boot the iBook G4 with the options:
"video=radeonfb:off radeon.agpmode=-1 radeon.modeset=1"
and play a video with mplayer.
If, OTOH, I leave off the KMS, then I don't get the GPU lockups that I reported.
Anyway, things are *way* better with 2.6.38 than with 2.6.39, as with 2.6.39 the kernel doesn't even get the colors correctly---everything that should be red becomes blue and so forth (any kind of endianness problem?).
I am attaching here another stacktrace, in case it helps.
Regards,
Rogério Brito.