reducing power usage of Fedora - how you can help!

Alan Cox alan at
Thu Aug 9 22:06:57 UTC 2007

On Thu, Aug 09, 2007 at 11:06:27PM +0200, nodata wrote:
> Suggestion: Disable 'hal' from polling your cdrom with:
> hal-disable-polling /dev/scd0        'hal' is the component that
> auto-opens a
> window if you plug in a CD but disables SATA power saving from kicking
> in.

Hal burns power on many laptops - as it stops the CD drive sleeping of its
own accord. However while it fashionable to bash the authors that one isn't
really their fault. Its also something vendors recognize is a real problem
and upcoming hardware has some sanely designed asynchronous notification
handling so the drive can wake up, chew the disk and wake the OS without

> Suggestion: enable AC97 powersave mode by executing the following
> command:
>    echo 1 > /sys/module/snd_ac97_codec/parameters/power_save
> or by passing power_save=1 as module parameter.

This really ought to be the default.

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