I did some further testing. It all depends on what devices are selected:

Playback:
Logitech Logitech USB Speaker USB Audio (ALSA)     does not work
ALSA - Advanced Sound Architecture                          works

Mixer: 
Playback: ALSA PCM on front: 1 (USB Audio) via DMA  hotkeys works
Logitech USB Speaker (Alsa mixer)                               hotkeys does 
not work.

So, by trial and error the user is able to select working devices. Why
there are many bogus devices on the list?

If I disconnect the USB and connect it again. The audio stops working
despite the fact that the selections above are not changed.

-- 
Problems with USB-speakers
https://bugs.launchpad.net/bugs/123992
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