ALSA, via 82xx, ALC650, and multichannel output.

ALSA, via 82xx, ALC650, and multichannel output.

[Ivan Gyurdiev]

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I attempted posting this to the alsa mailing lists, but I'm not subscribed,
and I think it's waiting for moderator approval. In any case, ALSA being part 
of the kernel, here's my bug report:

This is using the driver from alsa-project on a 2.4 kernel (details below):
============================================================
I'd like to confirm a bug report (follows) on my system:

The System:
        Gigabyte GVAXP-Ultra with onboard RealTek ALC650 soundcard.
        Altec Lansing 251 5.1 surround speaker system (analog)
        Kernel: 2.4.21-pre5-ac3
        Alsa: 0.9.2
        lsmod:
                [root@cobra phantom]# lsmod
                Module                  Size  Used by    Tainted: P
                nvidia               1592672  10  (autoclean)
                snd-pcm-oss            54500   1
                snd-mixer-oss          18456   0  [snd-pcm-oss]
                snd-via82xx            17996   1
                snd-pcm                93920   0  [snd-pcm-oss snd-via82xx]
                snd-timer              22600   0  [snd-pcm]
                snd-ac97-codec         46624   0  [snd-via82xx]
                snd-mpu401-uart         5856   0  [snd-via82xx]
                snd-rawmidi            20960   0  [snd-mpu401-uart]
                snd-seq-device          6796   0  [snd-rawmidi]
                snd                    53380   0  [snd-pcm-oss snd-mixer-oss 
snd-via82xx
snd-pcm snd-timer snd-ac97-codec snd-mpu401-uart snd-rawmidi snd-seq-device]
snd-page-alloc          8984   0  [snd-via82xx snd-pcm]

The Problem:
        My speakers have a switch between 2/4 channels and 6 channels.
        When in 6-channel mode, nothing will play on the center and rear 
speakers, unless I enable Duplicate Front. When in 4 channel mode, all 
speakers play. Apparently, multichannel output isn't working.

Note: I have unmuted almost everything, including
CENTER, SURROUND, LFE....

Additional info:
        I think I compiled with debug on, but I'm not sure anymore.
        I get these messages:

ALSA ../alsa-kernel/pci/via82xx.c:675: invalid via82xx_cur_ptr, using last
valid pointer
ALSA ../alsa-kernel/pci/via82xx.c:675: invalid via82xx_cur_ptr, using last
valid pointer



==============================================================
Original report:

>
> # From: Armando
> # Subject: [Alsa-user] Multichannel in Realtek ACL650 (via_82xx)
> # Date: Tue, 25 Mar 2003 07:44:17 -0800
> Hi:
>         I downloaded ALSA drivers v0.9.0rc6 and I'm using them now. They
work
> correctly, but this Sound card (I have a Gigabyte GA7-VAX mobo) is
> multichannel (up to 6.1) in Windows.
>       I'm currently using 2.1 speakers configuration, but I have 4.1
> speakers, can I enable 4.1 output? Is it possible with current drivers?
> How?
>
>
> P.D.: This soundcard uses the line-in connector for rear speakers. (in
> 4.1 mode).
>
> Thanks for your help.
>
> -=ArCePi=-
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