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

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

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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



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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.
diff -urN alsa-driver-1.0.8.orig/sound/Documentation/VIA82xx-mixer.txt alsa-driver-1.0.8/sound/Documentation/VIA82xx-mixer.txt
--- alsa-driver-1.0.8.orig/sound/Documentation/VIA82xx-mixer.txt	1970-01-01 01:00:00.000000000 +0100
+++ alsa-driver-1.0.8/sound/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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