Public bug reported:

Hi,

I wanted to disable the firefox "alert" sound... So I searched the web
and I found a lot of tips...

One of them was about opening "unity-control-center sound" and setting
"Mute" in the "Sound Effects" tab.

Unfortunately, as soon as I did launch "unity-control-center sound"
trouble arose:

- I'm listening to music using "jango.com" (i.e. using Firefox+flash plugin)
- When the song changes or I reload the page, a new "Firefox" (in fact 
"CubebUtils") entry appears in the "Applications" tab of "unity-control-center 
sound".
- Unfortunately, this new entry has a volume set to 0.

This means that, as soon as "unity-control-center sound" is opened, I
have to go set the sound volume at every song change. This does not go
away with closing unity-control-center.

However, opening unity-control-center has no effect on default volume
for mplayer, vlc, etc., only FF/flash...

Fortunately, it disappears with a reboot, but it is VERY annoying

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Hi,
  
  I wanted to disable the firefox "alert" sound... So I searched the web
  and I found a lot of tips...
  
  One of them was about opening "unity-control-center sound" and setting
  "Mute" in the "Sound Effects" tab.
  
  Unfortunately, as soon as I did launch "unity-control-center sound"
  trouble arose:
  
  - I'm listening to music using "jango.com" (i.e. using Firefox+flash plugin)
  - When the song changes or I reload the page, a new "Firefox" (in fact 
"CubebUtils") entry appears in the "Applications" tab of "unity-control-center 
sound".
  - Unfortunately, this new entry has a volume set to 0.
  
  This means that, as soon as "unity-control-center sound" is opened, I
  have to go set the sound volume at every song change. This does not go
  away with closing unity-control-center.
  
  However, opening unity-control-center has no effect on default volume
  for mplayer, vlc, etc., only FF/flash...
+ 
+ ~$ cat /etc/lsb-release 
+ DISTRIB_ID=Ubuntu
+ DISTRIB_RELEASE=16.04
+ DISTRIB_CODENAME=xenial
+ DISTRIB_DESCRIPTION="Ubuntu 16.04 LTS"
+ 
+ With lastest updates as of today
+ 
+ ~$ dpkg --get-selections | grep flash
+ flashplugin-installer                           install
+ gnome-flashback                                 install
+ gnome-flashback-common                          install
+ gnome-session-flashback                         install

** Description changed:

  Hi,
  
  I wanted to disable the firefox "alert" sound... So I searched the web
  and I found a lot of tips...
  
  One of them was about opening "unity-control-center sound" and setting
  "Mute" in the "Sound Effects" tab.
  
  Unfortunately, as soon as I did launch "unity-control-center sound"
  trouble arose:
  
  - I'm listening to music using "jango.com" (i.e. using Firefox+flash plugin)
  - When the song changes or I reload the page, a new "Firefox" (in fact 
"CubebUtils") entry appears in the "Applications" tab of "unity-control-center 
sound".
  - Unfortunately, this new entry has a volume set to 0.
  
  This means that, as soon as "unity-control-center sound" is opened, I
  have to go set the sound volume at every song change. This does not go
  away with closing unity-control-center.
  
+ This is also the case when watching/changing video on YT with HTML5
+ player...
+ 
  However, opening unity-control-center has no effect on default volume
- for mplayer, vlc, etc., only FF/flash...
+ for mplayer, vlc, etc., only FF/flash/HTML5...
  
- ~$ cat /etc/lsb-release 
+ ~$ cat /etc/lsb-release
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=16.04
  DISTRIB_CODENAME=xenial
  DISTRIB_DESCRIPTION="Ubuntu 16.04 LTS"
  
  With lastest updates as of today
  
  ~$ dpkg --get-selections | grep flash
  flashplugin-installer                           install
  gnome-flashback                                 install
  gnome-flashback-common                          install
  gnome-session-flashback                         install

** Description changed:

  Hi,
  
  I wanted to disable the firefox "alert" sound... So I searched the web
  and I found a lot of tips...
  
  One of them was about opening "unity-control-center sound" and setting
  "Mute" in the "Sound Effects" tab.
  
  Unfortunately, as soon as I did launch "unity-control-center sound"
  trouble arose:
  
  - I'm listening to music using "jango.com" (i.e. using Firefox+flash plugin)
  - When the song changes or I reload the page, a new "Firefox" (in fact 
"CubebUtils") entry appears in the "Applications" tab of "unity-control-center 
sound".
  - Unfortunately, this new entry has a volume set to 0.
  
  This means that, as soon as "unity-control-center sound" is opened, I
  have to go set the sound volume at every song change. This does not go
  away with closing unity-control-center.
  
- This is also the case when watching/changing video on YT with HTML5
- player...
+ However, opening unity-control-center has no effect on default volume
+ for mplayer, vlc, etc., only FF/flash...
  
- However, opening unity-control-center has no effect on default volume
- for mplayer, vlc, etc., only FF/flash/HTML5...
- 
- ~$ cat /etc/lsb-release
- DISTRIB_ID=Ubuntu
- DISTRIB_RELEASE=16.04
- DISTRIB_CODENAME=xenial
- DISTRIB_DESCRIPTION="Ubuntu 16.04 LTS"
- 
- With lastest updates as of today
- 
- ~$ dpkg --get-selections | grep flash
- flashplugin-installer                           install
- gnome-flashback                                 install
- gnome-flashback-common                          install
- gnome-session-flashback                         install
+ Fortunately, it disappears with a reboot, but it is VERY annoying

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https://bugs.launchpad.net/bugs/1586323

Title:
  Opening unity-control-center mutes Firefox/Flash sound

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