On Wed, 2012-08-01 at 09:58 +0100, Chris Wilson wrote: > On Wed, 01 Aug 2012 09:45:04 +0100, James Bottomley > <james.bottom...@hansenpartnership.com> wrote: > > On Wed, 2012-08-01 at 09:16 +0100, Chris Wilson wrote: > > > On Wed, 01 Aug 2012 09:06:12 +0100, James Bottomley > > > <james.bottom...@hansenpartnership.com> wrote: > > > > I got the attached to apply and it doesn't really improve the idle power > > > > much (12.5W). > > > > > > That's good to know. Next step is to try overriding i915.semaphores. > > > Can you please test with i915.semaphores=0 and i915.semaphores=1? > > > > There's not much point doing i915_semaphores=1 since that's the default > > on gen 6 hardware, but i915_semaphores=0 recovers and idle power of > > ~6.5W > > It is only the default if iommu is off, and changing the default > was one of the side-effects of the patch you bisected.
Sandybridge mobile doesn't have an iommu (or at least, if it does, the kernel doesn't detect it). > Can you please login to the desktop, let it idle, record > /sys/kernel/debug/dri/0/i915_cur_delayinfo and .../i915_drpc_info. > Then trace-cmd record -e i915 sleep 10s, and follow up with a new pair > of /sys/kernel/debug/dri/0/i915_cur_delayinfo and .../i915_drpc_info. > > This will let us see whether the pm counters are truly advancing and > what activity the driver is performing whilst idle. With or without i915_semaphore=0? James _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel
