Lost HDMI sound after upgrading to 17.10

Which release did you upgrade from?
What method was used?
What was the previous release?
What audio output method do you use?

> Which release did you upgrade from?

16.04 I beliewe

> What method was used?
https://www.linuxbabe.com/ubuntu/upgrade-from-ubuntu-16-0417-04-to-ubuntu-17-10

History:
1190 sudo apt update && sudo apt dist-upgrade
1191 sudo apt install update-manager-core
1192 do-release-upgrade

> What was the previous release?
> What audio output method do you use?

alsa, or what do you mean?

lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a4)
00:1f.0 ISA bridge: Intel Corporation Q67 Express Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04)

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CX20642 Analog [CX20642 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
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Did you upgrade to 16.10, then to 17.04 and then to 17.10?

From 16.04.

16.04 -> 17.04 -> 17.10

Try:

killall pulseaudio; rm -r ~/.config/pulse/* ~/.pulse*

wait 10 seconds, then reboot.

I did it already. And reboot too.
pulseaudio seems not killed.

 -
$ sudo killall pulseaudio; rm -r ~/.config/pulse/* ~/.pulse*
rm: cannot remove '/home/huduguru/.pulse*': No such file or directory

$ ps fax | grep audio
28923 ? Ssl 0:00 \_ /usr/bin/pulseaudio --daemonize=no
29309 pts/0 S+ 0:00 | \_ grep --color=auto audio
28921 ? Sl 0:00 /usr/bin/pulseaudio --start --log-target=syslog
-
 It seems Intel integrated HDMI video/audio is not supported in 17.10, isn't it?
https://askubuntu.com/questions/980203/how-to-install-the-latest-intel-graphics-driver-in-ubuntu-17-10

If you use:

alsamixer

Are all levels maxed and unmuted? Use M to un/mute. ESC to exit and cursor keys as you expect. Use F6 to change the device you are manipulating.

Hello. System reverted back to 16.04. Case closed.