Public bug reported:

Some devices have very office-oriented hardware and so, low volume power 
speakers.
The normal usage can make the sound unhearable on those configurations.

We added in u-c-c an option to switch it above 100%, per max volume
capability, and unity was picking up this value in its indicator and
u-s-d.

We desire thus to bring the same experience in the new ubuntu GNOME
Shell session: gnome-control-center have a slider enabling setting the
volume above 100%, however, this settings is only available in that
panel, and if you use the media key or the GNOME Shell controls, volume
is reset at 100% at max.

Upstream GNOME doesn't seem to have genuine interests in enabling that feature 
(see the discussion on the linked bug report). The proposal is thus:
- only enabling that feature in the *ubuntu* sessions. Don't let the sound 
(even if the key was enabled in the ubuntu session) goes above 100% in the 
gnome sessions to preserve upstream desired experience.
- reuse the same gsettings key (as long as it's not upstream) as we used to 
have. Easy migrations, user's setting preservation and such
- add this switch to gnome-control-center
- modify GNOME Shell agregate menu (volume settings) to represent the % in the 
volume slider corresponding to actual setting. We approach this as a distro 
patch and not an extension. The extension approach was hacky (overriding a 
callback, copying logic), and may work badly with well-designed other 
extensions. Hence this untrusive distro-patch.
- patch gnome-settings-daemon volume plugin for respecting this settings in the 
global OSD and react to media keys
- add a dependency from the ubuntu-session package on the schema, as reading 
the schema is conditioned on the session name.

** Affects: gnome-settings-daemon
     Importance: Unknown
         Status: Unknown

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gnome-session (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gnome-settings-daemon (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: GNOME Bug Tracker #710424
   https://bugzilla.gnome.org/show_bug.cgi?id=710424

** Also affects: gnome-settings-daemon via
   https://bugzilla.gnome.org/show_bug.cgi?id=710424
   Importance: Unknown
       Status: Unknown

** Also affects: gnome-session (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: gnome-shell (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: gnome-settings-daemon (Ubuntu)
   Importance: Undecided
       Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1706524

Title:
  Enable switch option to set volume above 100% from media keys and
  gnome shell UI

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