[Debian-eeepc-devel] saving battery

[Hans-J. Ullrich]

Am Samstag, 13. Februar 2010 schrieb Daniel Dalton:
> Hi,
Hi Daniel,

> 
> I'm trying to get as much battery life out of my eeepc as possible. It's
> really good, I can currently get about 5 hours or just over on my
> 1008ha. I've turned off bluetooth, wireless and the screen as I'm
> blind.
> I have also enabled laptop-mode from the debian package
> laptop-mode-tools.
> 
> What else can I do to save battery? I read somewhere I can throttle down
> the cpu speed when necessary? Or is this a dangerous procedure? Also is
> it possible to turn off power to the ethernet port as I rarely use
> this...
> 
If speed is not so important for you (and I suppose, you need no X), it might 
be possible, to throttle your cpu down to 800Hz. When you work in console, the 
clock frequency of your cpu will not be such important to the speed. 

How this is done, I cannot tell. As I am using X, my first choice is 
powerdevil, which is X related. Maybe someone else can tell, how hold cpu 
clock down in console. I think, it might be a command to the /proc interface.

This will save some extra power. In BIOS all not necessary interfaces can be 
switched off (also the gprs interface, which might save extra power, too)

Another thing is, to deinstall all not needed services. Some services, like 
snort or virus scan, do need some cpu power. Yes, and java might increasing 
cpu power was well. 

I suggest furthermore, to deinstall all packages, you do not need. Remember, 
every service or process, you are running, might need extra power.

Ah, yes, one thing may also save power: You can switch off all logging, or do 
all lojgging to an SD-card , RAM-drive or USB-stick. Doing so, you can inhibit 
permanently writing to the harddrive, justonly when you need it. If you do not 
need logging at all, just switch it off.

If you do so, you can switch off the harddrive, which saves power, too. When 
you want to write to the harddrive, there is a short delay, but this will not 
bother, I think.


> Or is what I'm doing now about the best you can do? I'm very happy with
> it, but of course if I can increase it by half an hour or so I
> definitely will. Mainly I'm just using it for taking down notes, and
> every now and then connect to the wifi...
> 
> Thanks for any suggestions
> Dan


I hope these little tipps might help.

Good luck!

Hans

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