i915 update to Linux 3.8 ready!

[Ed Maste]

On 15 March 2016 at 19:59,  <am_dxer at fastmail.fm> wrote:
>
> Thank you both for the suggestions. After suspending and resuming the
> machine, I find that the power used by the GPU is significantly less.

Thank you for testing, and I see the same behaviour on my Thinkpad
X220: after loading i915kms.ko only RC6 is nonzero and RC6+ and RC6++
remain at zero, while after
boot RC6++ is much higher.

I noticed one other interesting point: before suspending RC6 residency
is high but unchanging, while after suspending RC6++ continually
increases.

As I noted on this mailing list a little while ago there have been
some commits in Linux that seem to be related, although they were for
the case of increased power consumption _after_ suspend. (The two
commits are in code review at https://reviews.freebsd.org/D5599).

I'll continue investigating.