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-control-applet").
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)
-----------
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-control-applet"|
awk {'print $2'})
Step 2: Relaunch the volume-control process
$ sudo mate-volume-control-applet
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-control-applet" go to >
Sound Preferences > Hardware Tab > Profile Drop Down ... should now show all
the available sound devices including the HDMI output to the TV.
-----------
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.
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https://bugs.launchpad.net/bugs/1377653
Title:
HDMI sound output not detected / NVIDIA optimus laptop
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