[ubuntu] Ubuntu 16.04 LTS - sound disappearing, 'Dummy Output' device appearing

Hi, last week I finally updated my 14.04 LTS system to 16.04. Right after the update I noticed this highly annoying issue with audio; it keeps disappearing. When I check the Sound Settings, I notice a output device called 'Dummy Output' has appeared and is selected. If I select my real audio device (and, possibly, stop/resume my audio source) the audio continues to play. This appears to occur at random intervals (anything from 5 minutes to an hour or so).

Exact steps to reproduce (well, on my system..):

1. Starts watching a movie (tried Movies, vlc, SMPlayer)
2. After a random amount of time the sound disappears, movie keeps playing
3. Taking a look to Sound Settings.. I notice an incorrect output device called Dummy Output has appeared and is selected (see screenshot)
4. I select the correct device and possibly stop/play the video player
5. Audio resumes properly

This is the output for aplay -l:

Code:

**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 9: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0

Any ideas appreciated.

- Matti

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[ubuntu] Ubuntu 16.04 LTS - sound disappearing, 'Dummy Output' device appearing