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Linux - Laptop and Netbook Having a problem installing or configuring Linux on your laptop? Need help running Linux on your netbook? This forum is for you. This forum is for any topics relating to Linux and either traditional laptops or netbooks (such as the Asus EEE PC, Everex CloudBook or MSI Wind).

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Old 09-23-2005, 10:04 AM   #1
harisund
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Registered: Sep 2005
Location: Baton Rouge
Distribution: Ubuntu 5.10
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Want to do learn some battery saving methods


Hello everyone

I am using Mepis on a Compaq Presario V2000z.

Pretty much everything "just works".

However, what I am interested in are some serious power saving methods.

I run fluxbox instead of the default KDE (of course, with a simple apt-get install fluxbox) and use gkrellm for the perfect monitor (cpu, memory, Wlan, mem and battery)

I am having a 12 cell battery, and I bought it only for increased battery life.

I would like to know how I can increase my battery life (I had posed a similar question earlier, but the answers I am expecting are different now)

I am basically comparing Linux to Windows here. This is what Windows does for my power saving features.
1. CPU Frequency Scaling. My machine has a 1.5 Gig CPU, but Windows runs it at 750 Mhz all the time. Can GNU/Linux do that? Can I check if it is doing that?
2. I believe AMD itself has something called PowerNow technology. If I am not much mistaken, there is a powernowd module or something, right? How do I get that to work?
3. Other powersaving stuff like switching off hard disk, switching off monitor after a certain period of inactivity, etc.

Thanks people. I really want some help on this. I bought a 12 cell battery and don't want Linux to run it like I am running a 6 cell battery
 
Old 09-23-2005, 10:22 AM   #2
jtshaw
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When you do a cat /proc/cpu what speed does it register at?

There is a program out there called powernowd that I run on my laptop. You can configure it to work a number of different ways, but I believe the default policy is to run at the slowest possible speed when on battery with load load, increase speed to meet load conditions, and run at full speed when on AC power.

Powernowd does require (I think) that you have all the ACPI modules availible with your kernel.

Last edited by jtshaw; 09-23-2005 at 10:25 AM.
 
Old 09-23-2005, 10:32 AM   #3
harisund
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cat /proc/cpu
cat: /proc/cpu: No such file or directory

Wow ! Now what?
 
Old 09-23-2005, 10:47 AM   #4
jtshaw
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opps, my bad

cat /proc/cpuinfo
 
Old 09-23-2005, 07:09 PM   #5
harisund
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Hi

Thanks a lot for your suggestions.

I installed powernowd.

I also had a look at the Battery Powered Linux How To and it had some good tips.

The output of cat /proc/cpuinfo showed me that my processor was indeed running at 800mhz.

By the way, the stuff in /proc/acpi is pretty amazing.

I am also able to switch of my hard disk at will. Cool.

By the way, I am able to put the laptop into suspend mode (S3 or S4) but I am not able to wake up from it. Do you know any way I can do that? I guess it would be great, since I can write a small script that powers down the hard disk,monitor and puts the computer into standby whenever I am taking a short break away from the laptop.

Thanks a lot anyway !

Regards
Hari
 
Old 09-23-2005, 08:57 PM   #6
edong23
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i am also seeking the power saving options... but here is the deal. i have a 1.4 gig celeron m and i am using the frequency modulation with it, and it works!!! wouldnt with windows, for what little time i had windows on it anyway, i can tune it down to 175 mhz and up to 1.4 gig, and my desktop responds slower with it at 175 and everything... cat /proc/cpuinfo tells me 1.4 gig though, and the battery life is no different. is this cause the celeron isnt supposed to be modulated... if so why does the modulation work, and y does it not give better battery life...????? thanks in advance.
 
  


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