RC6 for an Intel GU doesn't always work

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Sometimes - after a reboot or after wakeup from s2disk I'm observed at
my ThinkPad T420 (i5-2540M CPU) w/ integrated intel graphic (i915
module) since 3.6-rc(5?), that the temperature is above 80°C (usually it
is around/lower than 50 °C). Powertop-2.1 shows, that the all 4 CPU
cores are mostly idle, but the GPU is running at 100%. It looks for me
that the power saving mode RC6 isn't active.

After 1-2 s2ram's however the issue went away.

I'm observing the issue both under my Gentoo Linux and under a RH system
(kernel 3.6.1 each).

It is hard to bisect b/c not reliable.

-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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