How can I disable a PCI or USB device (including the video card)?

Hi
I'd like to save some power and reduce the heat of my fanless barebone (an atom-based arctic mc001, see here;
http://www.amazon.fr/gp/product/B005DL6 … 5DL6V8G%22
It consumes 25W idle, and gets a bit hot.
So I'd like to disable some of the devices I don't use.
For instance:
- the internal wifi dongle (appears in lsusb)
- the internal TNT tuner (appears in lsusb)
- the internal DVD drive
- the internal radeon graphic card
For all of these devices, I do a "echo 1 > unbind" in sysfs, for the correct devices.
After that, all these devices seem 'disconnected' IE they no t not appear anymore in lsusb or lspci (for the radeon)
I also put the USB ports in 'auto' power mode
After that, the devices do not generate any IRQs or wakeups anymore, according to powertop...
But the power consumption does not decrease a lot... less that 1W...
So I wonder if the fact to unbind the devices really disconnects them or not.
Especially for the radeon... shouldn't I underclock it as much as possible instead? If so, how?
Thanks for your help.
Eric

I can't really help you much but to give you a warning. underclocking/undervolting too much can damage a video card without your knowledge, if your going to underclock it make sure you do stabilty tests. Your also gonna need it for any graphics environment you may want if your processor doesn't have one, unless your going command line only. you can try seeing if disabling it with rf-kill does anything. you can also use iwconfig to turn on power saving on your wifi-card, and try adjusting your cpu scaling as well. logically I would'nt worry about the dvd if heat is our concern a dvd drive in standby is proably not going to be throwing off a lot of heat or use very much power.. the big players are probably going to be your cpu, gpu and maybe that wifi card I know when mine is in use it just drains the battery with out power-saving. as for the tuner I have no idea. I hope this post can give you some ideas and maybe move you in the right direction. I can't garentee that all of this is accurate, some of it is logical assumptions. just trying to throw out some ideas to help a fellow arch -linuxer

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