[Bug 111909] commit c1132367 "Extract GT render sleep (rc6) management" prevents entering s2idle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111909

--- Comment #15 from Kenneth C <kenny at panix.com> ---
So this is interesting: I was browsing the list of DRI/i915 bugs and saw
https://bugs.freedesktop.org/show_bug.cgi?id=111594 ([guc/huc] Deep Package
C-states never reached after laptop screen is turned off) and verified that
indeed (on my branch of Linus' tip with all recent DRI/i915 changes unmerged) I
also never go back into GFX%rc6 states after a suspend.

So I'd added the patch in https://patchwork.freedesktop.org/patch/337552/ (and
modifying the condition to essentially read "if(false)" as my tree doesn't have
the "submission_supported" structure member and commit 724df646c8037 has it
explicitly disabled anyway).

Long story short though, no-oping intel_guc_resume() has allowed my machine to
have GFX%rc6 after a suspend, and I suspect it may help with s0 idle power
consumption as well.

I do have "enable_guc=2" set so I may get HuC operation, BTW.

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