Hi,

I wanted to save some energy and I tried to suspend few devices in my laptop, for example sound card. I did it using:
echo -n 2 >/sys/devices/pci00:.../power/state
It supposed to switch the state of the card from D0->D3 and indeed I have got positive message in syslog but the energy consumption did not change. My question: it is possible (in windows xp it is - I checked it) to power off devices like sound card, network itd. to save energy?
My aim is to achieve power rate 7000mWh - that is the best result I have got on windows platform (the best linux result is around 10000mWh). It is possible? (I mean maybe the linux kernel need more energy then windows)
I have ICH7-M chipset, 2.0 ACPI compliant.
See you.