[Bug 30557] cpu idle time in /proc/stat wrong

[James Stembridge]

Public bug report changed:
https://launchpad.net/malone/bugs/30557

Comment:
I can comfirm (thanks to Davyd's tip) that this problem is indeed
related to C-states.

Setting the max cpu C-state to C2 (it spends most of it's time in C3 by
default) using:

echo 2 > /sys/module/processor/parameters/max_cstate

Causes the /proc/stat values start to increase by reasonable values and
more importantly cpufreq_conservative actually starts to scale the cpu
speed when idle.