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1b1ed1a
(Get the code!)
Have a similar issue with my HP Pavilion DV6 Laptop under both Ubuntu 16.04 and Ubuntu Mate 16.04 using pulse audio.
Video still displays out of HDMI port to TV but Audio hardware device disappears from sound applet (in my case "mate-volume-
Curiously the HDMI device is visible at some level to aplay
$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: 92HD81B1X5 Analog [92HD81B1X5 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
Work-Around (temporarily SOLVES issue ... until the next time)
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I have developed the following work-around (for Mate ... but you can adapt it to standard Ubuntu) that recovers the HDMI sound (perhaps it may help users get by and/or some smart developer to track down the root cause):-
Step 0: Open your terminal ...
Step 1: Kill the (non-detecting) volume control process
$ kill -9 $(ps aux |grep -v 'sudo\|grep' |grep -e "mate-volume-
Step 2: Relaunch the volume-control process
$ sudo mate-volume-
Step 3: Then at the blinking terminal type
^Z
Step 4: Now complete the manual terminal tty disassociation by typing
$ bg
Step 5: Now when you right click on your "mate-volume-
-----------
The volume control applet just seems to forget about the sound hardware, never refreshes nor updates even with the HDMI lead being disconnected and reconnected.