Re: [alsa-devel] Audinst HUD-mx2 covertly muting itself

Tobias Klausmann wrote:

While the device works right in principle, every time an app closes the device, it mutes itself (or crash, this may be a Hw problem). There is no indication of the broken state in the mixer displays of alsamixer or alsamixer-gui, and amixer output does not indicate any change, either (see below).

The USB Audio Specification defines a mechanism with which a device could notify the PC of changes in mixer controls. However, this device does not have such a mechanism, so this looks like a firmware bug.

Does this happen for both the analog and digital outputs?

The vendor does not officially support anything but Windows

Does it work correctly in Windows without any vendor-supplied driver?

Regards, Clemens