[alsa-devel] EeePC 1005PE microphone is "stereo only", silent in mono

Paul Menzel paulepanter at users.sourceforge.net
Wed Aug 3 10:56:01 CEST 2011

Am Mittwoch, den 03.08.2011, 08:26 +0200 schrieb Takashi Iwai:


> From: Takashi Iwai <tiwai at suse.de>
> Subject: [PATCH] ALSA: hda - Fix digital-mic mono recording on ASUS eeePC

The official spelling seems to be Eee PC [1].

> The digital-mic unit on ASUS eeePC gives PDM signals instead of the normal


> stereo PCM, thus you can't record a mono stream from the stereo stream as
> is; the summing the stereo signal results in almost zero level, and you'll

Should »the summing« be »in summary«?

> hear only noise.
> As a workaround, use ALC269-specific COEF to manipulate the dmic route
> for mono, like used for ALC271x.  Since this is implemented as a fix-up
> and the auto-parser works fine for eeePC, the patch drops the model
> quirk entries for them, too.

So as a consequence everyone using `model=auto` can drop that from

I do not know how high the regression chance might be, but if there is
any, maybe split the patch and write all models in the commit summary

        ALSA: hda - Use auto parser for ASUS UX50, Eeepc P901, Eeepc S101 and P1005HA

for people looking through the commit log.

> Reported-by: Pavel Roskin <proski at gnu.org>
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> ---
>  sound/pci/hda/alc269_quirks.c |    7 -------
>  sound/pci/hda/patch_realtek.c |   26 ++++++++++++++++++++++++++
>  2 files changed, 26 insertions(+), 7 deletions(-)




[1] http://www.asus.com/Eee/
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