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

Clemens Ladisch clemens at ladisch.de
Thu Oct 31 16:53:57 CET 2013

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?


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