Re (2): Basic check of sound hardware?

In article <lq39e2zfc3.fsf@xxxxxxxxxxxxxxxxxxxxxxxxx>, Vilmos Soti <vilmos@xxxxxxx> wrote:

no.top.post@xxxxxxxxx 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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