Comment 40 for bug 541511

> --- Comment #38 from legolas558 <email address hidden> 2010-03-26 07:08:31 PST ---
> Can we state that the pre-KMS driver was working good enough because bug was
> harder to trigger in those conditions? I can say I experienced lockups when
> watching videos or when shutting down even with the pre-KMS/Xorg1.6 combo, but
> it was rare.

Yep, the cache coherency bug was most likely always there. kms code tends
to be faster in certain circumstances and therefore tends to hit cache
coherency problems with a higher probability. That's also why Eric's patch
from half a year ago managed to break a few i855 chipsets by slightly
changing the timings. But that's just coincidental because that piece of
code helps cache coherency on i865 chipsets.

btw, I've tried your two-glxgears-with-clipping test. No ill effects, here
...