No echo of Microphone input

[sara fink]

I don't like the mismatch between audio of nvidia and kernel module of
intel. There isn't a nvidia audio module?
try this:

grep -i snd /usr/src/linux/.config

I would rather go for an older nvidia audio module than an intel one.

Also, if you try to play the movie with mplayer from command line it will
show you what it uses as well (besides lsmod).

Did you configured module autoload?
*etc*/*modules*.*autoload*.*d*/*kernel*-*2.6*

On Sat, Feb 6, 2010 at 11:47 PM, shimi <linux-il at shimi.net> wrote:

> All,
>
> I've recently purchased a new machine, with an ASUS M4N78 PRO
> motherboard and have installed Gentoo Linux on it with Kernel 2.6.31
> (upgraded later to 2.6.32 - no change).
>
> Following is lspci output of Audio controllers:
>
> $ /usr/sbin/lspci | grep Audio
> 00:07.0 Audio device: nVidia Corporation MCP72XE/MCP72P/MCP78U/MCP78S
> High Definition Audio (rev a1)
> 02:00.1 Audio device: ATI Technologies Inc R700 Audio Device [Radeon
> HD 4000 Series]
>
> I believe the first device is my onboard audio card, and the second
> device is the embedded audio out on the HDMI output of my ATI HD4670
> video card.
>
> Therefore, I am attaching the -v version of lspci on that specific card:
>
> 00:07.0 Audio device: nVidia Corporation MCP72XE/MCP72P/MCP78U/MCP78S
> High Definition Audio (rev a1)
>        Subsystem: ASUSTeK Computer Inc. Device 836c
>        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 21
>        Memory at fbe78000 (32-bit, non-prefetchable) [size=16K]
>        Capabilities: [44] Power Management version 2
>        Kernel driver in use: HDA Intel
>        Kernel modules: snd-hda-intel
>
> Now to my problem...
>
> Everything seems to be working right. I can hear audio on all channels
> (tried a 5.1 movie...), except for the echo output of the Microphone
> input which I use to hear Television audio on my computer audio
> system. At first I thought that I damaged the audio cable (it worked
> on the old machine...), have bad motherboard connector or any other
> similar thing, but after plugging in an mp3 player with a different
> cable and still not even a hum, eventually I tried to *record* into a
> file and then playback the result. To my surprise, I heard what was
> earlier played into the Mic jack. I double/triple/quadruple checked in
> alsamixer that all inputs are at maximum volume, including on the
> capture device, and all are UNmuted, plus tried flipping between the
> various "capture source"s to no avail.
>
> After some more digging, googling et al, I've got to:
> /usr/src/linux-`uname -r`/Documentation/sound/alsa/HD-Audio.txt
>
> Specifically to the part of 'Model Option' as a possible culprit;
> However, my specific model does not appear on the list, as far as I
> could have seen; So I tried being generic, and added:
>
> options snd_hda_intel model=6stack-digout bdl_pos_adj=32 single_cmd=1
>
> To my /etc/modprobe.d/alsa.conf
>
> My questions, if you got so far, are:
>
> 1. How do I know I did it right and that the module actually processed
> these variables? The reason I am worried is because I still see the
> error: "hda-intel: IRQ timing workaround is activated for card #1.
> Suggest a bigger bdl_pos_adj." in dmesg.
> 2. Any hints on how to progress on this? Or should I get my old SB
> Live 5.1 sound card and override the problem altogether...
>
> Thanks in advance,
>
> -- Shimi
>
> _______________________________________________
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> Linux-il at cs.huji.ac.il
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>
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