Ubuntu
linux package

  1. Bug #877560
  2. Comment #50

Comment 50 for bug 877560

Revision history for this message
khink (kees-fmf) wrote :

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.