Another "me too":
$ sudo powertop
Summary: 461.2 wakeups/second, 57.9 GPU ops/seconds, 0.0 VFS ops/sec and 10.0%
CPU use
Usage Events/s Category Description
36.3 ms/s 242.7 Process /usr/lib/firefox/firefox
100.0% Device Audio codec hwC0D3: Intel
100.0% Device Audio codec hwC0D0:
Realtek
$ uname -a
Linux zeno 3.8.0-21-generic #32-Ubuntu SMP Tue May 14 22:16:46 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux
$ lspci | grep audio
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family
High Definition Audio Controller (rev 04)
The workaround
$ echo 1 | sudo tee /sys/module/snd_hda_intel/parameters/power_save
$ echo Y | sudo tee /sys/module/snd_hda_intel/parameters/power_save_controller
$ pkill pulseaudio
worked, even without logging out and in (but not using audio).
Side note: using pm-powersave was a much bigger improvement on battery
usage, 22W down to 13W.
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https://bugs.launchpad.net/bugs/877560
Title:
Audio codec draining power when not in use
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