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

On 11/20/2012 09:32 AM, Takashi Iwai wrote:

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 mode.

Thanks. But I have also recently seen a computer where powertop showed a Watt number, essentially saying that the codec consumed 1.4 Watts or so (I don't remember the exact number). Have you seen that too?