[Bug 54089] [SNB regression] Power consumption goes postal after resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54089

--- Comment #64 from Konstantin Khlebnikov <koct9i at gmail.com> ---
I have checked all patches which I found here. Without any success.

Bug happens not only after suspend-resume cycle, sometimes it just happens
without any particular activity, for example when I'm reading emails.
Suspend-resume is just fastest way to reproduce this, for my x220 it's taking
just couple suspend-resume cycles. I have tried to disable turbo-mode, and even
set GEN6_RP_CONTROL to zero, so it's something deeper. Also I cannot find any
lightweight magic sequence for returning gpu into sane state which can be used
in watchdog.

When bugs happens, gpu generates bunch of GEN6_PM_RP_UP_EI_EXPIRED |
GEN6_PM_RP_UP_THRESHOLD events. Seems like some its internal state is broken
and gpu thinks that it's extremely busy. Is there any way to examine or reset
this state?

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