[ltp] X60s and other CoreDuos / Battery LIfe - Kernel/CPU freq scaling iss

Ari El linux-thinkpad@linux-thinkpad.org
Mon, 30 Oct 2006 05:51:47 -0800 (PST)

Tino Keitel-3 wrote:
> Have you tried this?
> $ echo "userspace" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> $ echo "userspace" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
> $ echo 1000000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
> $ echo 1000000 > /sys/devices/system/cpu/cpu1/cpufreq/scaling_setspeed
> Regards,
> Tino
> -- 
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad

Hi Tino, by setting the powersave governor, the kernel automatically selects
the lowest available frequency (1000000) and keeps it there (that's the way
this governor works). Likewise with performance, it selects the highest
available freq.

Just in case I tried your userspace method too, results are exactly the

Since it looks like you have a core duo machine, can you mention if you
actually see a difference in power consumption when change the frequency
from 1G to 1.66G using this method? If so what is it (mW)? 

I'm asking because I don't see any change at all in my case. When the
computer idles I see, with most modules unloaded and display level 0,
9600mW; and when working (word processing) averaging about 9900mW, and this
is regardless of the frequency the core are working on.


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