Their should be script which invoke when laptop runs in battery power. It change the cpu-frequency, usb_suspense etc.
Which script is done this job in Ubuntu? I need to change power saving strategy. Every time Ubuntu suspense USB device when run in battery power.
For that I have to run command manually to off the USB suspense.
Measure power consumption with powertop
Before you start making any changes, it is a good idea to first get a base line for what your current power consumption is:
sudo aptitude install powertop
sudo powertop
You must be running on battery power for powertop to get the machine's current watt usage.
Using less power with pm-powersave
The pm-utils package comes with scripts for managing low-power modes.
sudo aptitude install pm-utils
In order to enter low power mode, run this:
sudo pm-powersave true
In order to leave low power mode, run this:
sudo pm-powersave false
