Re: [ALSA - driver 0000628]: Can't record audio

[Ross Kendall Axe <ross.axe@blueyonder.co.uk>]

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Ross Kendall Axe wrote:
> Takashi Iwai wrote:
>
>> At Thu, 20 Jan 2005 21:00:18 +0000,
>> Ross Kendall Axe wrote:
>>
>>> | ======================================================================
>>> | Summary:                    Can't record audio
>>> | Description:
>>> | I'm not able to record any audio. Reading from /dev/dsp results in an
>>> | "Input/Output Error".
>>> | The hardware I'm using is Soltek 75DRV5 with built-in soundcard.
>>> | ======================================================================
>>> |
>>> | ----------------------------------------------------------------------
>>> |  rossaxe - 01-16-05 17:09
>>> | ----------------------------------------------------------------------
>>> | What is this particular knob supposed to do? So far as I can tell,
>>> it just
>>> | offers a choice betweens 'works' and 'breaks'
>>> |
>>> | ----------------------------------------------------------------------
>>> |  tiwai - 01-17-05 15:07
>>> | ----------------------------------------------------------------------
>>> | This defines the connection of which input pin is selected for the
>>> certain
>>> | input path.  So, whether it works or not strongly depends on the
>>> hardware.
>>>
>>> Wouldn't it make sense to disable it on hardware for which it does
>>> not work?
>>
>>
>>
>> Yep.  Patches are welcome :)
>>
>
> Hmm. Probably best save that until I'm at least a *half* decent kernel
> coder :-)
> Meanwhile, a note in the docs probably wouldn't go amiss. Patch attached.
>
> Ross
>

And here's an unbroken patch, with a signed-off-by line as well :-)

Ross



Add warning about the consequences of adjusting the 'Input Source Select'
of VIA82xx.

Signed-off-by: Ross Kendall Axe <ross.axe@blueyonder.co.uk>

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diff -urN alsa-driver-1.0.8.orig/alsa-kernel/Documentation/VIA82xx-mixer.txt alsa-driver-1.0.8/alsa-kernel/Documentation/VIA82xx-mixer.txt
--- alsa-driver-1.0.8.orig/alsa-kernel/Documentation/VIA82xx-mixer.txt	1970-01-01 01:00:00.000000000 +0100
+++ alsa-driver-1.0.8/alsa-kernel/Documentation/VIA82xx-mixer.txt	2005-01-21 14:58:41.000000000 +0000
@@ -0,0 +1,8 @@
+
+				VIA82xx mixer
+				=============
+
+On many VIA82xx boards, the 'Input Source Select' mixer control does not work.
+Setting it to 'Input2' on such boards will cause recording to hang, or fail
+with EIO (input/output error) via OSS emulation.  This control should be left
+at 'Input1' for such cards.

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