I think it might be that powertop is on crack here. I see that at the
top of powertop's overview all the time (with only a few terminals
open), but on powertop-1 it never shows up. Here's a snapshot of both,
taken at the same time (on precise):
powertop:
Usage Events/s Category Description
2316 rpm Device Laptop fan
100.0% Device Audio codec hwC0D0:
Conexant
16.3 ms/s 85.9 Process /usr/bin/X :0 -auth
/var/run/lightdm/root/:0 vt7 -novtswitch -background
16.9 ms/s 59.5 Process compiz
powertop-1:
Top causes for wakeups:
29.5% (136.3) [Rescheduling interrupts] <kernel IPI>
17.0% ( 78.7) [i915] <interrupt>
11.5% ( 53.0) compiz
8.1% ( 37.7) [ehci_hcd:usb2] <interrupt>
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https://bugs.launchpad.net/bugs/877560
Title:
Audio codec draining power when not in use
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