[mythtv-users] Advice required on low wattage combined system

Marco Nelissen marcone at xs4all.nl
Mon May 29 19:56:21 UTC 2006


>No, you need to do a bit more ;) I'll give a *very* brief description.
>
>Basicly you just have to make sure the powersaving bits are enabled in the kernel.
> 
>To check if your currently running kernel supports PowerNow!, do 
>   dmesg | grep powernow
>Example output:
>powernow-k8: Found 1 AMD Athlon 64 / Opteron processors (version 1.00.09e)
>powernow-k8:    0 : fid 0xc (2000 MHz), vid 0x2 (1500 mV)
>powernow-k8:    1 : fid 0xa (1800 MHz), vid 0x6 (1400 mV)
>powernow-k8:    2 : fid 0x2 (1000 MHz), vid 0x12 (1100 mV)
>
>If not, you need to recompile your kernel. 
>When enabled, you then add a line to /etc/conf.d/local.start (or similar file if not using
>Gentoo):
>echo conservative > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>
>That should do it. You can check with 
>cat /proc/cpuinfo
>
>A full guide with more details and examples can be found here, it's written for Gentoo, but should
>work with other flavours as well: http://gentoo-wiki.com/HOWTO_PowerNow%21

Thanks. Turned out I only needed to enable the "ondemand" governor.
Too bad dropping the frequency only reduced power consumption by about 7 Watts.


More information about the mythtv-users mailing list