[alsa-devel] 100.0% power usage of Device Audio codec (HDA) on wake

Takashi Iwai tiwai at suse.de
Tue Nov 20 09:32:55 CET 2012

At Tue, 20 Nov 2012 09:07:21 +0100,
David Henningsson wrote:
> It does put another question - from where does powertop get its values, 
> and do we have to do anything on our side to make sure / aid them being 
> correct?

powertop checks /sys/class/sound/hwC*D*/power_{off|on}_acct files.
They contain the time (in ms) how long the codec is in the power-save


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