No ALSA devices in Bitwig Studio 1.3.6 on Ubuntu

This is entirely the fault of the Bitwig developers, and after all of this time they have still not fixed the fault. I cannot take credit for this, please see the original thread where this was found.

Here is how the problem manifests itself: You'll go into Options > Preferences > Audio, select ALSA, and find that there are no compatible ALSA devices in the devices list.

The problem is that the Bitwig .deb package does not list libxcb-icccm4 as a dependency; presumably they assumed you'd have it installed. Simply install it:

$ sudo apt-get install libxcb-icccm4

ALSA devices should now be visible in the device selector. Now! If you get a message about the audio device being busy or that it could not be opened for some reason, remember that there is a high chance you're using a sound daemon of some sort. I'm going to assume you're using PulseAudio, because this is a post specific to Ubuntu, but if you're on some other distribution that uses a different sound daemon, then just look up what the equivalent for that daemon is.

To fix this, you need to run Bitwig studio like this:

$ pasuspender -- bitwig-studio

This suspends the PulseAudio sound daemon while Bitwig runs, so that Bitwig can have exclusive access to the underlying sound-card without going through PulseAudio, and then un-suspends it when you exit Bitwig.