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Re (2): Basic check of sound hardware?

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In article <lq39e2zfc3.fsf@pia.msmri.medicine.ubc.ca>, Vilmos Soti <vilmos@soti.ca> wrote: 

> no.top.post@gmail.com writes:
> 
> > My MOBO has got the 3 sockets for sound, which I understand are:
> > left out, mic in, right out.
> > 
> > So just to confirm that the hardware is OK, what's the basic CLI command to:
> > => input from mic-socket to a file;
> 
> cat /dev/audio > file
> 
	`ls -l /dev/audio` is OK
	
> > => output the same file to left/right out ?
> 
> cat file > /dev/audio
> 
 I used a *.wav that lasted many seconds, but heard no sound on
 the earphones on any of the 3 sockets.
 What about going to a lowe level?  Shouldn't the sound-system be detected
 during boot-stage?  `dmesg` shows nothing for sound.
 This MOBO has got 2 USB sockets, but they seem dud and there's a 
 daughter-board with 2 working USB sockets. I'm guessing that the 
 previous owner damaged the MOBO USBs.  Can't that also happen to
 the sound chip?
 
 If it's a problem of IRQ setting, I guess `dmesg` would show that it
 was trying something?
 
> Hey, you can even do a "cat /dev/audio > /dev/audio"
> to test full duplex. You should hear anything you
> speak into the mic back within a few (at most 10)
> seconds.
> 
> In earlier systems, I could even do something like this:
> cat /dev/audio
> 
> And watch the stuff on the screen. It was a fairly uniform
> pattern. Once I started to talk into the nic, the pattern
> drastically changed. Unfortunately, this very handy behaviour
> is not there anymore.
> 
> > Or does the mic-signal need to be amplified?
> 
> For this simple test, no.
> 
> Vilmos

Yes, that's only possible if the lower-level is working first.

Thanks.

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Thread

Basic check of sound hardware? no.top.post@gmail.com - 2011-11-05 15:43 +0000
  Re: Basic check of sound hardware? Vilmos Soti <vilmos@soti.ca> - 2011-11-05 09:47 -0700
    Re (2): Basic check of sound hardware? no.top.post@gmail.com - 2011-11-06 03:27 +0000
    Re (2): Basic check of sound hardware? no.top.post@gmail.com - 2011-11-15 20:18 +0000
      Re: Re (2): Basic check of sound hardware? Vilmos Soti <vilmos@soti.ca> - 2011-11-16 22:55 -0800
        Re (3): Basic check of sound hardware? no.top.post@gmail.com - 2011-11-27 18:37 +0000
  Re: Basic check of sound hardware? Bit Twister <BitTwister@mouse-potato.com> - 2011-11-05 16:57 +0000
    Re (2): Basic check of sound hardware? no.top.post@gmail.com - 2011-11-06 03:27 +0000
      Re: Re (2): Basic check of sound hardware? Clemens Ladisch <clemens@ladisch.de> - 2011-11-29 21:04 +0100
    Re (2): Basic check of sound hardware? no.top.post@gmail.com - 2011-11-15 20:18 +0000

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