Comments on: How To: Increase Battery Life in Ubuntu or Debian Linux

By: Robert

Robert — Tue, 11 Nov 2008 18:33:59 +0000

aditya, yeah, that’s why laptop_mode is disabled in /etc/default/acpi on install. However, on the IBM T60 and Dell D620 and D630 that I’ve used, I haven’t run into a single problem, and the benefits have been huge (I ran 2 VMWare workstation guests the whole flight from Chicago to LA last night on battery power).

By: aditya

aditya — Mon, 10 Nov 2008 07:32:50 +0000

There are some severe problems with acpi laptop mode. Harddisk load cycles increase rapidly causing Harddisk failure. Bugs exist on launchpad and forums also.

By: links for 2008-10-06 : kozaru

links for 2008-10-06 : kozaru — Mon, 06 Oct 2008 14:03:00 +0000

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By: merlin

merlin — Tue, 23 Sep 2008 16:40:30 +0000

And what about Power Manager being part of Gnome by default ?
It is managing power in userspace mode and that’s not the best as you mentioned, but won’t all your tweaks be in conflict with Power Manager settings ? Is it necessary to uninstall (or deactivate ?) Power Manager befor using these tricks ?

By: Robert

Robert — Tue, 12 Feb 2008 21:41:45 +0000

Karlo – cpufreqd.conf lives directly in /etc – it’s installed as part of “cpufreqd” via “apt-get install cpufreqd”. Without the daemon from that package, the conf file won’t help.

You’re probably having an issue getting the Conservative governer loaded, because it’s not being loaded. Above you’ll see my modprobe commands for loading “cpufreq_conservative” by hand. To make it load every time, you can edit /etc/modules and add “cpufreq-conservative” and any others you want, to the end of that file – one module per line.

Otherwise, your setup looks good, since all the governors are available, and cpufreq-info is giving the proper information back.

By: Karlo

Karlo — Tue, 12 Feb 2008 03:18:35 +0000

question, you didn’t include the paths where to edit the configuration files… like cpufreqd.conf , where is it located..

also, when running cpufreq-info, I receive the following message:

cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time: 0
hardware limits: 600 MHz – 1.70 GHz
available frequency steps: 1.70 GHz, 1.40 GHz, 1.20 GHz, 1000 MHz, 800 MHz, 600 MHz
available cpufreq governors: conservative, ondemand, powersave, userspace, performance
current policy: frequency should be within 1.70 GHz and 1.70 GHz.
The governor “ondemand” may decide which speed to use
within this range.
current CPU frequency is 1.70 GHz.

I can’t change it to conservative etc…

I am using Aser Aspire 5502 ZWXMi Laptop, Intel Pentium M processor 735 1.7 GHz 400 MHz FSB 2 MB L2 Cache.