linux-kernel - Realtek codec eating up battery?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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
DSA: 0x09C5B094   fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
------------------------------------------------------------------------
`You know they've reintroduced the death penalty for
insurance company directors?'
No I didn't. For what offence?'
Trillian frowned.
`What do you mean, offence?'
`I see.'
                 --- Evidence that there will be some justice in the Universe
                 --- eventually.
                 --- Douglas Adams, The Hitchhikers Guide to the Galaxy
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/