ALC883 Detection Issue

ALC883 Detection Issue

[Kip Warner]

Greetings,

I have an Intel HDA sound board with a Realtek ALC883 chipset. This is built into my four speaker ASUS A7J laptop.

When I modprobe snd-hda-intel, I see the following in the kernel log:

hda_codec: Unknown model for ALC882, trying auto-probe from BIOS...

I have tried experimenting with a number of different model strings for snd-hda-intel, all to no avail.

I hear sound, but only out of the front two speakers. Alsamixer shows that it thinks the chipset is the Realtek ALC882 and only gives a slider for Headphone, Front, Line, CD, Mic, ... but with no "Rear" channel.

"speaker-test -c4" confirms this because it only makes an audible hiss with the front two speakers but immediately goes silent with the back two. It looks like it is using the wrong chipset with the wrong speaker configuration.

I have been wrestling with this for weeks and to no avail. I am using Alsa 1.0.12.rc1 with kernel 2.6.17.3. In my kernel options I enabled sound but disabled Alsa. I compiled Alsa manually with ./configure --with-cards=hda-intel. I have also tried the latest source from the HG repository. Same thing.

Any help would be much appreciated.

--
Kip

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Re: ALC883 Detection Issue

[Takashi Iwai]

At Fri, 28 Jul 2006 20:59:53 -0700,
Kip Warner wrote:
> 
> Greetings,
> 
> I have an Intel HDA sound board with a Realtek ALC883 chipset. This is built into my four speaker ASUS A7J laptop.
> 
> When I modprobe snd-hda-intel, I see the following in the kernel log:
> 
> hda_codec: Unknown model for ALC882, trying auto-probe from BIOS...
> 
> I have tried experimenting with a number of different model strings for snd-hda-intel, all to no avail.
> 
> I hear sound, but only out of the front two speakers. Alsamixer shows that it thinks the chipset is the Realtek ALC882 and only gives a slider for Headphone, Front, Line, CD, Mic, ... but with no "Rear" channel.
> 
> "speaker-test -c4" confirms this because it only makes an audible hiss with the front two speakers but immediately goes silent with the back two. It looks like it is using the wrong chipset with the wrong speaker configuration.
> 
> I have been wrestling with this for weeks and to no avail. I am using Alsa 1.0.12.rc1 with kernel 2.6.17.3. In my kernel options I enabled sound but disabled Alsa. I compiled Alsa manually with ./configure --with-cards=hda-intel. I have also tried the latest source from the HG repository. Same thing.
> 
> Any help would be much appreciated.

It's not the matter of "detection".  It's that simply your device is
unsupported.  We'd need some additional code to create the
initialization verbs and mixer elements matching with the actual
device configuration.

It's not a too hard work, but pretty difficult without the hardware to
test in hand.  So, if you're interested in debugging it, take a look
at pci/hda/patch_realtek.c, and create the similar entry for your
own device.  The device is identified via PCI subsystem ID (see "lspci
-nv" output).


Takashi

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