[Bug 92414] [Intel-gfx] As of kernel 4.3-rc1 system will not stay in S3 suspend [REGRESSION][BISECTED]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92414

--- Comment #5 from Doug Smythies <dsmythies at telus.net> ---
Additional information:

After the first resume from suspend, the processor is in a bizarre state, where
it will not go below 2.4 GHz, even though every CPU is asking for a pstate of
16 (the minimum for my processor). This has been tested several times, on both
the preceding (good) and first bad kernels using both methods of suspend.

My processor: Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz

Example (no load):

pstate being asked for:

# rdmsr --bitfield 15:8 -d -a 0x199
16
16
16
16
16
16
16
16

pstate that I am getting:

# rdmsr --bitfield 15:8 -d -a 0x198
24
24
24
24
24
24
24
24

CPU freqs:

# grep MHz /proc/cpuinfo
cpu MHz : 2400.054
cpu MHz : 2399.921
cpu MHz : 2399.921
cpu MHz : 2399.921
cpu MHz : 2399.789
cpu MHz : 2399.789
cpu MHz : 2399.921
cpu MHz : 2399.921

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