[SOLVED] Using the "powersave" governor on battery and "ondemand" governor on AC power

piratesmack · 01-21-2010, 12:24 AM

I want my computer to use the "ondemand" CPU frequency scaling governor when plugged in and switch to the "powersave" governor when running on battery power.

Is this possible?

gbonvehi · 01-21-2010, 01:19 AM

The answer is yes

And here's a good explanation on how to do it trough scripts: http://granapadano.blogspot.com/2009...-linux-26.html

piratesmack · 01-21-2010, 11:52 AM

Quote:

Originally Posted by gbonvehi

The answer is yes

And here's a good explanation on how to do it trough scripts: http://granapadano.blogspot.com/2009...-linux-26.html

Thanks, I'll check that out

manwichmakesameal · 01-21-2010, 12:30 PM

That's amazing, I was just thinking about this exact same thing the other day. I didn't really do anything about it, just thinking about it. Maybe this is a sign.....

alunduil · 01-21-2010, 12:42 PM

If you have KDE 4 you just need the governors in your kernel and powerdevil will start using them.

Regards,

Alunduil

piratesmack · 01-21-2010, 12:54 PM

Worked great. I'd prefer to use a bash script instead of python, so I came up with this.

Code:

#!/bin/sh

if grep -q 'on-line' /proc/acpi/ac_adapter/*/state; then
  GOV="ondemand"
else
  GOV="powersave"
fi

for cpu in /sys/devices/system/cpu/cpu?/cpufreq/scaling_governor; do
  echo $GOV > $cpu
done

Thanks again.