Public bug reported:

Running Ubuntu Mate 20.04 on Raspberry Pi 4 with Dual Monitor Set-up

Description:    Ubuntu 20.04.1 LTS
Release:        20.04
Packages involved:  Unknown

Issue: I can choose either 2 HDMI monitors or sound but not both
Expected: Sound works with both monitors plugged in

(1) No sound from headphone jack or HDMI in two monitor configuration
(2) If I unplug 2nd monitor and reboot, sound works fine in HDMI or headphone 
jack
(3) If I plug in second monitor while Pi is running, no picture in second 
monitor but sound still works
(4) Sound works normally in Raspbian

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-1025.28-raspi 5.4.73
Uname: Linux 5.4.0-1025-raspi aarch64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: arm64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  loreleiandmike   1211 F.... pulseaudio
 /dev/snd/pcmC2D0p:   loreleiandmike   1211 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Wed Jan  6 19:45:47 2021
ImageMediaBuild: 20200812
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:b1 failed
Symptom_Card: Built-in Audio - bcm2835 Headphones
Symptom_DevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  loreleiandmike   1211 F.... pulseaudio
Symptom_Type: No sound at all
Title: [bcm2835_hdmi - bcm2835 HDMI 1, playback] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: apport-bug arm64 focal uec-images

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https://bugs.launchpad.net/bugs/1910471

Title:
  [bcm2835_hdmi - bcm2835 HDMI 1, playback] No sound at all

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Running Ubuntu Mate 20.04 on Raspberry Pi 4 with Dual Monitor Set-up

  Description:  Ubuntu 20.04.1 LTS
  Release:      20.04
  Packages involved:  Unknown

  Issue: I can choose either 2 HDMI monitors or sound but not both
  Expected: Sound works with both monitors plugged in

  (1) No sound from headphone jack or HDMI in two monitor configuration
  (2) If I unplug 2nd monitor and reboot, sound works fine in HDMI or headphone 
jack
  (3) If I plug in second monitor while Pi is running, no picture in second 
monitor but sound still works
  (4) Sound works normally in Raspbian

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 5.4.0-1025.28-raspi 5.4.73
  Uname: Linux 5.4.0-1025-raspi aarch64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: arm64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  loreleiandmike   1211 F.... pulseaudio
   /dev/snd/pcmC2D0p:   loreleiandmike   1211 F...m pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: MATE
  Date: Wed Jan  6 19:45:47 2021
  ImageMediaBuild: 20200812
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:b1 failed
  Symptom_Card: Built-in Audio - bcm2835 Headphones
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  loreleiandmike   1211 F.... pulseaudio
  Symptom_Type: No sound at all
  Title: [bcm2835_hdmi - bcm2835 HDMI 1, playback] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)

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