Video and Audio = Hangs

[Fernando Apesteguía]

Hello people,

I had some hangs with my computer and after a bit of testings I was
able to reproduce it always.

If I'm playing music and I try to use the Video card extensively
(moving Page Up and Down in Evince - this makes my CPU go to 100%) the
system hangs. It doesn't matter if I'm in X11 or console (mplayer
playing music and pdftotext rendering also hangs)

Any ideas?
Any clues to perform more tests?

Thanks in advance