Topping D10s DAC auto standby?

[Nutul]

The real issue though is the DAC firmware should be checking the audio signal and not the power to determine whether to blank it's display.

Absolutely right,

though, since this is not the case with "some" DACs (or other products) would it be possible to have a man-in-the-middle checking the audio signal, and if it is not playing for some time issue a power-off on the USB bus? Although at the moment nothing comes to mind, Linux surely allows some dirty things to be done...

Only my awoke-5-minutes-ago-had-no-coffee-yet thought...