https://bugs.freedesktop.org/show_bug.cgi?id=56878
--- Comment #7 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #6)
agpmode=4 didn't help either. So are you saying that no one will fix this bug and everyone with this configuration remains at risk that the system freezes?
With AGP it depends on the motherboard, the card, the AGP mode, and the phase of the moon. Some combinations are stable, others are not.