What does “AL lib: alc_cleanup: 1 device not closed” mean?

The AL lib is the “audio library” used by Libgdx (one of the OpenAL variants).

I believe this message just means that the audio library is cleaning up some (in your case just one) audio streams/handles for you. If you see this at exit, its harmless as all resources will be cleaned up by the OS.

If you internally cleanup your audio before exiting, the message should go away.

For more details, look for alc_cleanup in here: http://repo.or.cz/w/openal-soft.git/blob/HEAD:/Alc/ALc.c

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