[ltp] Aggressive Powersaving

Tino Keitel linux-thinkpad@linux-thinkpad.org
Thu, 11 Feb 2010 08:33:37 +0100

On Tue, Feb 09, 2010 at 13:16:36 -0200, Henrique de Moraes Holschuh wrote:
> On Tue, 09 Feb 2010, Karsten König wrote:
> > the new kernels really brought down the power consumption and I am interested 
> > in getting it a little bit further, on the road I don't use my DVD drive nor 
> > ExpressCard nor USB nor Firewire nor Touchpad, is there a way to cleany cut 
> > the power to these devices/buses?
> Yes.  Disable them on the BIOS where possible, Linux doesn't put PCI devices
> in D3 state yet as a rule, so once a driver loads and brings that device to
> D0 state, the device will stay powered up.  There might be exceptions.

There was a discussion once which mentions setting the D3 state using
setpci. I tried it once for unused devices on my X61s but it did not
help regardung power saving.