I have a Lenovo x220 that dual boots xubuntu 12.04 and 12.10. Power consumption under 12.04, with wifi off, is about 8 watts according to powertop. The fan exhaust is cool. The laptop gets fantastic battery life, 6-7 hours.
Under 12.10, with the same software running and no wifi, powertop reports over 18-20 watts, the fan runs at high speed with a warm exhaust, and I get lousy battery life, 2-3 hours.
I have tried
and I suspended the internal camera with
echo Y >sys/module/snd_hda_intel/parameters/power_save_controller
echo 1 > /sys/module/snd_hda_intel/parameters/power_save
Any thoughts? There are other similar reports, but I have yet to see a solution.
echo 0 > /sys/bus/usb/devices/1-1.6/power/autosuspend