Massive power regression going 3.4->3.5

[Chris Wilson]

On Wed, 01 Aug 2012 10:07:23 +0100, James Bottomley <James.Bottomley at HansenPartnership.com> wrote:
> > 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?

With semaphores enabled so that we can see if they are active during the
idle period or if merely having used them at some point is enough to
trigger the issue. And to see if the pm counters bear any relation to
reality.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre