[IDEA] Automatically suspend USB DACs when idle

[bitlab]

@sll552 maybe a workarround:

• activate camilladsp as dsp option
  
• you can use the flat config to make sure that it doesn't alter the audio
  
• test if it works
  
• next we will run command before the audio device is started by:
  
• edit the file /etc/alsa/conf.d/camilladsp.conf
  
• add the following option (should be above the last '}' ):
  

Code:

 # An option not directly related to camilladsp.  A command to run when
     # the plugin is first created.  (Meaning when a playback program opens
     # the audio device.)  Use it for whatever you want.  Set gpio pins on a
     # raspberry pi to turn on your amp for example.
     start_cmd "/path/to/start_command"

Of course replace it by your command

If you are luckly enough it runs fast enough before camilladsp is started and opened the actual audio device.

Good luck!

Marcel