There are related bugs: Bug #144182 - Gutsy - Silicon Motion video driver freezes, corruption, and error reports Bug #136853 - Screen blanks and freezes after a few minutes of idling, possibly due to broken DPMS
and maybe this one is a duplicate of one of them.
There are related bugs:
Bug #144182 - Gutsy - Silicon Motion video driver freezes, corruption, and error reports
Bug #136853 - Screen blanks and freezes after a few minutes of idling, possibly due to broken DPMS
and maybe this one is a duplicate of one of them.