Comment 64 for bug 541511

> --- Comment #60 from legolas558 <email address hidden> 2010-03-31 02:01:45 PST ---
> Are you planning to submit the patch here before sending it upstream?

As soon as I post the patch for inclusion, I'll add a patch with all the
debugging stuff removed to this bug report.

> --- Comment #62 from Thorsten Vollmer <email address hidden> 2010-03-31 11:24:00 PST ---
> BTW: I was surprised to read that you are using an X40, because I would never
> have discovered this bug on my X40, my second machine. I have been using it for
> weeks with unpatched kernels and never saw any hangs. At first I hoped that my
> X40 was not affected and we could compare register settings. But with your
> patch applied, the kernel reports some flush retries. The frequency of failed
> flushes must be very low though.

Yep, my X40 is very stable with stock kernels. So I could never understand
all these bug reports about "intel drivers totally suck on i855GM"
because, hey, it works here! But a discussion with Chris Wilson about a
very strange bug report got me thinking. A few debug hacks later (to
stress the gtt) I've reduced the lifetime expectancy of my X40 to half a
minute :( With this, I've could then start hacking on solutions.

btw, these hacks are included in the patches posted here to really make
sure it works now. I'll drop them for the final rev.