From: David Henningsson <david.henningsson@canonical.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: Alsa-devel@alsa-project.org, Tomas Pospisek <tpo2@sourcepole.ch>
Subject: Re: 100.0% power usage of Device Audio codec (HDA) on wake
Date: Tue, 20 Nov 2012 09:56:19 +0100 [thread overview]
Message-ID: <50AB45B3.6060904@canonical.com> (raw)
In-Reply-To: <s5hpq38ptc8.wl%tiwai@suse.de>
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
next prev parent reply other threads:[~2012-11-20 8:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-16 14:23 100.0% power usage of Device Audio codec (HDA) on wake Tomas Pospisek
2012-11-16 16:04 ` Takashi Iwai
2012-11-17 0:48 ` Tomas Pospisek
2012-11-17 1:17 ` Tomas Pospisek
2012-11-17 10:53 ` Takashi Iwai
2012-11-20 6:54 ` Tomas Pospisek
2012-11-20 7:16 ` Takashi Iwai
2012-11-21 15:12 ` Tomas Pospisek
2012-11-20 8:07 ` David Henningsson
2012-11-20 8:32 ` Takashi Iwai
2012-11-20 8:56 ` David Henningsson [this message]
2012-11-20 9:01 ` Takashi Iwai
2012-11-21 14:15 ` Tomas Pospisek
2012-11-21 14:26 ` Takashi Iwai
2012-11-21 14:44 ` Tomas Pospisek
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