From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Henningsson Subject: Re: 100.0% power usage of Device Audio codec (HDA) on wake Date: Tue, 20 Nov 2012 09:56:19 +0100 Message-ID: <50AB45B3.6060904@canonical.com> References: <33f3a5d64a489d40499192a0659dd76c@sourcepole.ch> <50AB3A39.1090604@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by alsa0.perex.cz (Postfix) with ESMTP id 882CF265293 for ; Tue, 20 Nov 2012 09:56:22 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Takashi Iwai Cc: Alsa-devel@alsa-project.org, Tomas Pospisek List-Id: alsa-devel@alsa-project.org 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? -- David Henningsson, Canonical Ltd. https://launchpad.net/~diwic