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Re: Power saving in debian

On Wed, 24 Dec 2008 22:24:40 -0800
Amit Uttamchandani <amit.uttam@gmail.com> wrote:

> On Wed, 3 Dec 2008 00:34:34 +0100
> "Adem" <for-gmane@alicewho.com> wrote:
> > Hi,
> > how can I use powersaving in Debian?
> > I have Debian Lenny without a GUI desktop installed.
> > Mostly it is accessed via ssh and svn. 
> > How can I configure it so that during inactivity 
> > the HD, CPU, fan etc lower their energy consumption?

Fan should turn off automatically when temperature is low enough. If the cpu has
throttling support you can play with the scaling governor.

for the hard disk look into laptop mode, it allows holding writing to disk for
longer periods (cache disk writes in memory for 20-30 minutes) which allows the
disk to spin down. Also allows playing with disk power management (look into
hdparm also). if you put a slower disk in (5400 rpm instead of 7200 rpm it will
also reduce power consumption)

Look into

You may also want to mute audio.

> > Since I switch off the monitor manually, is there a way to also 
> > power down the graphics card because it is a real power hog I think?
> > 

depending on the graphic card and driver it may be possible to underclock it
(at least the more expensive nvidias have a possibility to overclock, possibly
underclock as well, with nvidia-settings, don't know about others).

you can also leave the machine headless (no graphic card) and just log in
remotely. There is a possibility to play with pci powersave but I don't know
much about it.

I think that xrandr can turn off the video output also, not sure of the command

> > 
> The hard drive can definitely be spin down automatically using power
> management scripts. I think you can configure it using acpi if I'm not
> mistaken.
> As for the graphics card...if you don't use a monitor why not remove it
> completely? As for powering it down, that won't be possible because of
> the way computers are designed. The only "computer" that does this is
> the OLPC.

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