Subject: Re: [linux-audio-user] USB Audio has played but no longer does so.
From: Martin Habets (errandir_news_AT_mph.eclipse.co.uk)
Date: Mon Sep 20 2004 - 04:24:13 EEST
Chris Lyon wrote:
>I'm sorry that I've obviously phrased this question all wrong.
>so I'll try to be a little bit more detailed this time.
>
>I have now installed Mandrake 10.1 on the machine.
>and now aplay -l does indeed report the existance of UA-100 card
>kscd shows all the typical signs of playing a cd, it lists tracks, it
>starts counting when play is pressed,
>But no sound emerges.
>amixer reports no mixer elements, or nothing.
>
>/proc/asound/cards displays an endless stream of
>0 [UA100 ]: USB-Audio - UA - 100
> Roland UA - 100 at usb-0000:00:07.2 - 2, full
>speed
I don't know what kernel version you're on, but there is a bug in procfs
in 2.6.8 that causes a cat of any file in /proc to loop endelessly.
>if I try to select a Device with
>aplay -D= *****
>nothing I type in seems to make any sense to it.
>if I try to list pcm devices to plug into the above line with aplay -D
>the results are to say the least incomprehensable.
With only one card you should no longer need to specify -D any more.
But normally "-D hw:0,0,0" should work if you have
/proc/asound/card0/pcm0p/sub0.
>Where do I go next? This used to work when I installed 9.2 originally
>but I have been poking & proding for 4 days now and It still desn't
>work. ONce again I apologies for the way I present my questions but I am
>NOT pestering before trying, I am on a last ditch attempt to play a CD
>on a linux box.
>I won't bore you with my background, but I have a little involvement in
>the synth, computing and audio field and yet this is now getting way
>beyond a joke. I have had this playing with Micheal Minns MMUSAUDIO .
>However ALSA seems the way to go for all things Audio and Linux.
>So how do you check the signal path in a system? and what do you do if a
>device appears not to be supported by the mixing facilities?
- If you cat /proc/asound/devices you should see a ctl and playback
device with "[0-..." in the line (0 is your card number I think).
- cat /proc/bus/usb/devices, look at the interfaces (I:) provided on you USB
device. And check if the interfaces have a "Driver=" entry.
My 2 cents,
Martin
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