[alsa-devel] Acer Aspire 8920g / snd-hda-intel / ALC889

Takashi Iwai tiwai at suse.de
Fri Apr 25 14:29:44 CEST 2008

At Wed, 23 Apr 2008 22:10:45 +0100,
Andy Green wrote:
> Somebody in the thread at some point said:
> >> Hm, then the problem is somewhere different.
> >> You hear neither from speaker nor HP-jack?
> > 
> > Nothing, despite changing settings "headphone" and "IEC958" in alsamixer 
> > -c0 (alsamixer by itself picks up pulseaudio nowadays apparently).  It's 
> > as if the amp is powered down, or we route everything to modem :-) 
> Just some derisory extra information, external mic jack is working fine 
> (and has bias voltage), Line-jack is also OK, but built-in mic is dead 
> with some very small noise, maybe it is not given bias.  If the issue 
> was basically power management enabling, it could make sense.
> I saw realtek are pretty good with their datasheets, but there is none 
> for ALC889 in their ftp site that has the rest.
> I also recompiled alsa 1.0.16 for grins but it didn't make any change. 
> I looked in alsa-kernel/pci/hda/patch_realtek.c and enabled 
> SND_CONFIG_DEBUG and SND_CONFIG_VERBOSE_PRINTK because there seemed to 
> be some extra features generated then for ALC device GPIO pin control. 
> But they didn't turn up in alsamixer.  Do you know if there is an 
> existing way to meddle with GPIO controls on ALC889 from inside ALSA easily?

Build CONFIG_SND_HDA_HWDEP=y and you'll have /dev/snd/hwC0D0 device.
With the hda-verb program in the URL below, you can exec the verb on
the fly:


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