Len Brown recently wrote the intel_idle driver, a special idle mode driver for intel processors that lets you use deeper idle modes even when your BIOS does not announce them. Now he kindly expanded that to the C6 state for the Atom processor from the C2 state before. Now it does not matter if your power adapter is connected or not, you can use the C6 state. And if your BIOS didn't support it at all before, now you can still use it with Linux. Just compile 2.6.36(-rc8) with intel_idle built in and check it out.
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