[linux-elitists] Simplest power management problem

Greg KH greg@kroah.com
Tue Aug 22 21:46:16 PDT 2006

On Tue, Aug 22, 2006 at 04:52:41PM -0700, Don Marti wrote:
> Question about power management: What if you don't
> want to turn the device back on again?  Say you
> have a motherboard with three different kinds of
> storage connections and you only have one hooked up,
> sound hardware you don't listen to because it's in
> the server room, and USB and VGA you'll only use if
> you're booted in single user mode for extreme live
> nude recovery.  What devices can you turn off and
> forget about?

Disable them in the bios, that's the best way to do this right now for
Linux :(

Who knows if it will really save you any power though, bioses aren't
known for being reliable that way.

If you are really brave, you can try to write a '0' to the 'power' file
for the pci device in sysfs to turn the device off.  But you need to
have the driver for the device loaded in order for this to work
properly, and it doesn't always work quite right just yet...

Yeah, power management on Linux sucks, go kick your friendly
neighborhood Intel/AMD/chipset engineer to get them to help us out with
the work that is needed to be done.  So far none seems to be emerging.

greg k-h

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