[Bug 1484587] Re: CPU frequency management fails to re-engage on resume from suspend

[Doug Smythies]

When a user is using the intel_pstate driver in performance mode, then
yes, prior to Kernel 4.2RC1 the CPU frequency will be typically be stuck
after resume from suspend.

This is not a pm-ultils issue (which is how I stumbled across this bug
report).

To test that the issue is fixed on kernel 4.2, just use primitive
commands and not these higher level utilities (that I neither use or
know anything about). For example use:

grep MHz /proc/cpuinfo

to observe CPU frequencies.

The commit that, I think, fixes this issue is:

commit 6c1e45917dec5e7c99ba8125fd8cc50f6e482a21
Author: Doug Smythies <doug.smythies at gmail.com>
Date:   Mon Jun 1 21:12:34 2015 -0700

    intel_pstate: Force setting target pstate when required

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https://bugs.launchpad.net/bugs/1484587

Title:
  CPU frequency management fails to re-engage on resume from suspend

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