How to fix battery indication in debian squeeze on Acer Aspire

June 17, 2011 by
Filed under: linux 

Problem:   acpi could not detect battery status, and shows unkown battery as:

$acpi

Battery 0: Unknown, 0%

Firstly, if you are on Acer Aspire xxxx (mine is Aspire 4745G), you need to upgrade the bios to a new version (such as BIOS_Acer_1.25_A_A.zip for 4745G).Just download the bios program here:

http://support.acer.com/us/en/product/default.aspx?modelId=2070
Secondly, enable acpi on boot option in /boot/grub/grub.cfg:

linux   /boot/vmlinuz-2.6.32-5-amd64 root=/dev/hda9 ro  acpi=on quiet
Then install powertop to check which process consumes lots of power,and cpufrequtils, laptop-mode-tools to automatically save your power.
sudo apt-get install powertop cpufrequtils laptop-mode-tools
restart you system.

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