Public bug reported:

When switching from HDMI audio to internal speakers, the sound stops
working altogether. The only way to prevent this is to enter the
settings while still connected to HDMI and select "Speakers - Built in
audio" as the output. Disconnecting from HDMI without doing this stops
any audio playing through internal speakers or headphones (including the
speaker test in settings). It was expected that disconnecting a HDMI
output would automatically change the sound output to internal speakers.
Attempting to click "Speakers - Built in audio" when disconnected from
HDMI has no effect, the only way to remedy this is to reconnect the
device to HDMI and select the  above output. This means if the device is
removed from HDMI and taken to another location, no sound can be used
until a HDMI output can be found and connected. Rebooting has mixed
effects, on one occasion a reboot restored the sound, however on all
others it does not. The test tones DID play during the debug process
however this is the only sounds I can get to play. The version of Ubuntu
is 18.04 LTS.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC1D0c:   laoise     1485 F...m pulseaudio
 /dev/snd/controlC1:  laoise     1485 F.... pulseaudio
 /dev/snd/pcmC0D7p:   laoise     1485 F...m pulseaudio
 /dev/snd/controlC0:  laoise     1485 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Thu May 31 14:35:41 2018
InstallationDate: Installed on 2017-04-13 (412 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Speaker, Internal
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: No sound at all
Title: [X555LA, Realtek ALC3236, Speaker, Internal] No sound at all
UpgradeStatus: Upgraded to bionic on 2018-05-12 (19 days ago)
dmi.bios.date: 08/14/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X555LA.308
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X555LA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX555LA.308:bd08/14/2014:svnASUSTeKCOMPUTERINC.:pnX555LA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX555LA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: X
dmi.product.name: X555LA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1774421

Title:
  [X555LA, Realtek ALC3236, Speaker, Internal] No sound when switching
  from HDMI to internal audio

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