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. FWIW, Acked-by: Chris Wilson <chris at chris-wilson.co.uk> -Chris -- Chris Wilson, Intel Open Source Technology Centre
