cpufreq doesn't work after changing power management config

otto80 · 28. Oktober 2013

Hello,

cpufreq seems not to be working anymore after changing the config under power management -> power button.
cpufreq-info says, cpufreq is not working.

Before applying the config, my boot log showed me this message:
Oct 28 10:27:46 openmediavault kernel: [ 14.024251] powernow-k8: Found 1 AMD Turion(tm) II Neo N54L Dual-Core Processor processors (2 cpu cores) (version 2.20.00)
Oct 28 10:27:46 openmediavault kernel: [ 14.024307] powernow-k8: 0 : pstate 0 (2200 MHz)
Oct 28 10:27:46 openmediavault kernel: [ 14.024309] powernow-k8: 1 : pstate 1 (1900 MHz)
Oct 28 10:27:46 openmediavault kernel: [ 14.024310] powernow-k8: 2 : pstate 2 (1600 MHz)
Oct 28 10:27:46 openmediavault kernel: [ 14.024312] powernow-k8: 3 : pstate 3 (1300 MHz)
Oct 28 10:27:46 openmediavault kernel: [ 14.024313] powernow-k8: 4 : pstate 4 (800 MHz)

Now, after a reboot the messages about the power states do not show up anymore.
This problem is reproduceable. After reinstalling omv, everything works. If i change the power button config again, i get the same problem.
Under /sys/devices/system/cpu/cpu0 should be files for cpufreq where i can see the powerstates. They are not there.

My question is, how do i repair this without reinstalling omv?
I'm using the latest version of omv 0.5.
Thanks in advance.

sgt-suicide · 18. Dezember 2013

Sry for the late answer- but I'm new here.

Pls check output

Code

lsmod | grep powernow

- should return

Code

powernow_k8            10962  0
processor              29903  1 powernow_k8

or similar.

If not your module is not loaded on boot, too. Fix by adding line

Code

powernow_k8

to /etc/modules right before the "loop" at the end of the file:

Code

# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
# Parameters can be specified after the module name.
powernow_k8
loop

Type

Code

cpufreq-info

at prompt, should return a lot of info: powernow_k8 as loaded driver, as well as supported cpu speed levels.

otto80 · 18. Dezember 2013

Thanks for the answer, but i solved the problem by installing the backports kernel.

TadeuszD · 4. März 2014

I encountered the same problem, described by otto80.
After clean installation of OMV my system was using powernow_k8 CPU driver and 'conservative' governor.
But after OMV configuration process those settings was disabled. I'm not sure, which operation disables frequency controll feature. I suppose that it was changed during the upgrading packages to newer version:

Code

apt-get update
apt-get upgrade

Anyway... Now I'm restoring old settings.
The /etc/default/cpufrequtils file in OMV contains the 'conservative' governor enabled by default:

Code

ENABLE="true"
GOVERNOR="conservative"
MAX_SPEED="0"
MIN_SPEED="0"

I added two lines to /etc/modules to enable missing modules:

Code

powernow_k8
cpufreq_conservative

But this configuration does not work as I expected. After reboot the system, the powernow_k8 CPU driver is properly used, but the governor is still switched to built-in 'ondemand' mode. To switch the governor to 'conservative' mode, I need restart the cpufreq service:

Code

/etc/init.d/cpufrequtils restart

What I should do to enable 'conservative' governor at the system boot?

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