On Wed, Jun 12, 2013 at 2:41 AM, Chris Wilson <chris at chris-wilson.co.uk> wrote: > On Tue, Jun 11, 2013 at 03:49:26PM -0700, St?phane Marchesin wrote: >> It's basically the same deal as the RC6+ issues on ivy bridge >> except this time with RC6 on sandy bridge. Like last time the >> core of the issue is that the timings don't work 100% with our >> voltage regulator. So from time to time, the kernel will print >> a warning message about the GPU not getting out of RC6. In >> particular, I found this fairly easy to reproduce during >> suspend/resume. >> >> Changing the threshold to 150000 instead of 50000 seems to fix >> the issue. >> >> I also measured the idle power usage before/after this patch and >> didn't see a difference on a sandy bridge laptop. >> >> Signed-off-by: St?phane Marchesin <marcheu at chromium.org> > > One magic number for another with no idea what is blowing up - I fear we > are just changing the frequency of the hang. I've pinged a number of snb > rc6 bug reports to see if we get a bite. Yup, if only Intel documented those registers :) St?phane > > FWIW, > Acked-by: Chris Wilson <chris at chris-wilson.co.uk> > -Chris > > -- > Chris Wilson, Intel Open Source Technology Centre
