On Thursday, November 7, 2013 11:52:13 AM UTC-7, Keith Ruenheck wrote:
>
> I have a Beaglebone Black running Angstrom 3.8.13 connected (through USB) 
> to a Burr-Brown PCM2900C CODEC. I can setup loopback with alsa, but not 
> pulseaudio.  The command is accepted, but the audio isn't looped back.  The 
> commands I'm using are:
>
> alsaloop  -C hw:1,0 –P hw1:0 –t 50000 –T 1 (which works), and
>
> pactl load-module module-loopback 
> source=alsa_input.usb-BurrBrown_from_Texas_Instruments_USB_AUDIO_CODEC-00-CODEC.analog-stereo
>  
> sink=alsa_output.usb-BurrBrown_from_Texas_Instruments_USB_AUDIO_CODEC-00-CODEC.analog-stereo
>  
> latency_msec=50 (which doesn't work)
>
> When I run the same pactl command on my laptop, running Fedora 19, it 
> works fine.
>
>
>
There's not enough information to say for sure, but there are a couple of 
things to check.  First, do a pactl list and see what state PulseAudio 
thinks its various components are in.  It's likely they're stuck in a 
SUSPENDED state for some reason.  I haven't configured pulseaudio on my 
Bone yet, but on my Pandaboard I had to change the /etc/pulse/daemon.conf 
file so that it used resample-method=speex-fixed-3 instead of speex-float-3.

If those ideas don't get you any further, try turning on more debugging 
information when you start up PulseAudio and give us a log dump. 

-- 
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