USB question

[Richard Kimber]

On Sat, 15 Sep 2018 16:22:15 +0200
Ralf Mardorf <silver.bullet at zoho.com> wrote:

> On Sat, 15 Sep 2018 12:48:57 +0100, Richard Kimber wrote:
> >Is there some other way I can track down what I need to do to ensure
> >the DAC is recognised without having to keep un-plugging and
> >re-plugging the USB cable?  
> 
> That's strange, if I reboot, my USB audio device is recognized without
> the need to replug it.
> 
> Maybe replugging your device just changes the card number.
> 
> Run 'aplay -l' before and after replugging.
> 
> You could allocate snd_usb_audio to a fixed card number by
> /etc/modprobe.d/alsa-base.conf.
> 
> $ aplay -l | grep card
> card 0: HDSPMx579bcc [RME AIO_579bcc], device 0: RME AIO [RME AIO]
> card 1: EWX2496 [TerraTec EWX24/96], device 0: ICE1712 multi [ICE1712
> multi] card 3: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
> card 3: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
> card 3: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
> card 3: HDMI [HDA Intel HDMI], device 9: HDMI 3 [HDMI 3]
> card 3: HDMI [HDA Intel HDMI], device 10: HDMI 4 [HDMI 4]
> card 4: USB [Scarlett 18i20 USB], device 0: USB Audio [USB Audio]
> $ cat /etc/modprobe.d/alsa-base.conf 
> # ALSA module ordering
> options snd slots=snd_hdspm,snd_ice1712,snd_ice1712
> 
> I don't reserve a card number for snd_usb_audio, but as you can see
> card 2 is reserved for a second ice1712 card.
> 
> 

Thanks I'll try that next time I reboot.

- Richard.
-- 
Richard Kimber