Massive power regression going 3.4->3.5

[James Bottomley]

On Wed, 2012-08-01 at 09:16 +0100, Chris Wilson wrote:
> On Wed, 01 Aug 2012 09:06:12 +0100, James Bottomley <James.Bottomley at 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

James