[Bug 76211] [hsw] i915 resume latency 1200ms

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=76211

--- Comment #13 from Len Brown <lenb at kernel.org> ---
> it panics on boot.

not always.
sometimes system freeze, sometime system reset.

once I got it to boot and was able to measure suspend/resume.

i915 suspend: 115ms

This is in parallel with the Lynx Point Audio, which is currently 224ms

i915 resume: invisible!

I ran this back-to-back with analyze_syspend -x2, and did not detect any
deferred i915 resume delaying a subsequent suspend.  (what happens if a suspend
request occurs when your deferred resume has not completed?)

So this patch looks like a very interesting prototype, but very unstable.

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