linux-kernel - Realtek codec eating up battery?

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Message-ID: <20120415233813.GA10731@gamma.logic.tuwien.ac.at>
Date:	Mon, 16 Apr 2012 08:38:13 +0900
From:	Norbert Preining <preining@...ic.at>
To:	linux-kernel@...r.kernel.org
Cc:	Takashi Iwai <tiwai@...e.de>
Subject: Realtek codec eating up battery?

Dear all,

(please Cc)

running a recent git kernel from today, I see the following in powertop:
  1.02 W    100.0%    Device         Audio codec hwC0D0: Realtek

I am quite sure that was not the case in former times, so I wanted to ask
if you think this is a kernel change or a user space change that is
responsible for that?

AFAIR before I was running on top of git 7c427f45, now
on git 6c23b8e9 and there have been quite some changes regarding realtek
in the meantime:
    * tag 'sound-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
      ALSA: hda/realtek - Fix mem leak (and rid us of trailing whitespace).
      ALSA: hda/realtek - Add quirk for Mac Pro 5,1 machines
      ALSA: hda/realtek - Add a fixup entry for Acer Aspire 8940G
      ALSA: hda/realtek - Fix GPIO1 setup for Acer Aspire 4930 & co
      ALSA: hda/realtek - Add a few ALC882 model strings back

output of dmesg wrt realtek/hda:
[   20.952213] snd_hda_intel 0000:00:1b.0: irq 47 for MSI/MSI-X
[   21.004975] hda_codec: ALC262: SKU not ready 0x411111f0
[   21.008167] input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/input/input10
[   21.011878] input: HDA Intel Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
[   21.013351] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12


Thanks a lot and all the best

Norbert
------------------------------------------------------------------------
Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
JAIST, Japan                                 TeX Live & Debian Developer
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