Public bug reported:
Binary package hint: powernowd
Apparently the kernel handles ACPI suspend by using CPU hotplug to stop
all but one CPU, and then using non-SMP-safe freeze code. This results
in the symptom I see on my core 2 duo desktop running AMD64 edgy: after
a resume, the governor for the second CPU is "performance", even though
powernowd is still running, and the first CPU is still being governed
properly by the userspace governor.
(The easiest way to check the current state is to run cpufreq-info from
the cpufrequtils package).
So powernowd needs to do something after a resume, probably by dropping
a script into /etc/acpi/resume.d.
** Affects: powernowd (Ubuntu)
Importance: Undecided
Status: Unconfirmed
--
seconds CPU uses "performance" governor after resume
https://launchpad.net/bugs/75438
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