[Bug 98979] [i915][HSW][PM] Unable to use GFX RC6 on Dell Precision M6800

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98979

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
The dmesg shows it is using rc6, at least.

"Powertop / turbostat -d show no GFX stats reported."

Literally, as in no page showing the GFXWatt and rc6 residency? Or just that
they don't vary. If the former, that is the /sys/class/drm/cardN/power
directory not being exposed. Shouldn't be affected by gvt at all (but yes, it
is pointless to build it - but it should just not even initialise on your hw
and not impact runtime at all).

However, the final figures still show no pc7 even though cpu + gpu is idle.
That usually takes i915.enable_fbc=1 as well.

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