ALSA error

[Steven Crook]

With the Pi on do you ever switch your DAC off or change the input?

Doing this would prolly cause an ALSA error since the USB device has gone away. When you turn the device back on though it should automatically be re-recognized by Linux after a few seconds.

I always turn the DAC off between sessions, always have done. The DAC boots slow-ish siting there thinking about things for a few seconds before it decides it's got a good input, then there's a tik noise from an internal relay and music flows. 

It appears that, once it's in this error state, there's no automatic recovery.

At some point today I'll power everything down, and be a bit more methodical on what I do and when going from startup to playback. Perhaps a pattern will emerge. I'll let you know.