sound recording does not work on intel HD audio ??

[Fred Schaer]

Hi,

Just for fun : I'm still trying things, but here are some results :

I managed recording audio with arecord with following command :
arecord -r 44100 -c 2 -f S16_LE | lame -x - out.mp3

Thing is that in order to get that, I had to
- I'm using the alsa option model=6stack
- have "Front Mic" selected as 1st input source (inpurt sources 2 and 3
don't seem to work at all)
- It is *Line in* controls that change the sound on the PC speakers
- Headphones have top be unmuted in alsa play section (why ??)
- in the alsamixer, "Digital" has to be about "-3.50" dB, otherwise,
there's either no sound or just cracking noise (!) -- by the way : is
this normal this gain can be set between -30 and +30 dB ?? I doubt these
values are usefull...
- capture volume does not seem to have any effect...

As you see, this is really really weird... I'm going to retry with no
module option, to see if it helped or not (considering the Digital dB
behaviour, I had no chance tweaking settings with kmix - dB values were
far too low or too high when adjusted with mouse...)

Cheers

P.S : I had no luck recording audio with mencoder , still trying but I
fear alsa recording is buggy there ;)


D. Michael McIntyre a écrit :
> On Saturday 05 January 2008, Fred Schaer wrote:
>   
>> I just checked, I don't have snd-hda-intel (or snd_hda_intel ?) anywhere
>> in /etc : maybe the module is loaded in the initrd ? In that case, I'll
>> try to regenerate the initrd files...
>>     
>
> You won't find a kernel module in /etc.  The modules are the various .ko files 
> under /lib/modules/$YOUR_KERNEL_VERSION, but you have no reason to go 
> screwing around with any of that.  The modules are not going to be loaded by 
> your initd, which is only for critical modules necessary for booting, like 
> the drivers for filesystems and various kinds of storage hardware.
>
> What you want to start with is lsmod to see which modules are loaded.  You'll 
> probably find your snd_hda_intel there.  I don't know how to fix your 
> problem, but I deal with how_to_get_sound_working issues constantly, and I've 
> seen a lot of people reporting problems with Intel and HD in them, to the 
> point where I really hate that chip, even though I don't know anything about 
> it.
>
> I'd try the ALSA upgrade first.  Who knows.
>