After install of Ubuntu Vidid 15 I can select sound options and then see the HDMI option for output. All is well.

I then run software 'Upgrade' and as soon as this completes the HDMI option is no longer available ?

Is there a way you can 'back out' the updates just applied ?

Is there anything I should do to debug this further.

This is a brand new installation,

Thanks in advance Dave

dave@dave-desktop:~$ uname -a
Linux dave-desktop 3.19.0-18-generic #18-Ubuntu SMP Tue May 19 18:31:35 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

dave@dave-desktop:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
  • sounds like you're asking two questions - one about rolling-back updates and the other about debugging your sound problem. Which is it that you most want? – Jason May 24 '15 at 9:58

The 3.19.0-18 kernel has a bug that breaks HDMI sound on intel HDA. Rollback your kernel by running

sudo apt-get purge linux-image-3.19.0-18-generic

Note this will also remove linux-generic* and linux-image-generic* which means Ubuntu will never offer to upgrade your kernel ever again, so you need to remember to check if it's fixed in a new kernel in a couple days and reinstall those packages.

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