Mute & unmute steadly decreases volume after repeated presses

Confirmed on a second (desktop) machine.

Here, I made a video about it :)

hotkey-setup just passes through the keys, it's gnome-settings-daemon that handles the actual changes.

Thanks for your bug report. This bug has been reported to the developers of the software. You can track it and make comments here: http://bugzilla.gnome.org/show_bug.cgi?id=400966

fixed upstream

That upload fixes the problem:

 control-center (1:2.17.91-0ubuntu1) feisty; urgency=low
 .
   * New upstream version:
     common:
     - Compilation fixes
     - Fixed localedir defines
     - Use standard installation paths
     - Use capplet name for G_LOG_DOMAIN
     - Require GTK+ <= 2.10
     about me:
     - Fix build with gcc 2
     - Fix memory leaks
     - Fix possible crash
     at-properties:
     - Fix reference leaks and dont segfault if glade file is not available
     default applications:
     - Use specific string as app ID in gnome_program_init
     - Plug memory leaks
     - Fix DATADIR define
     keybindings:
     - Issue a sensible error message when trying to use unmodified keybindings
       (Ubuntu: #82065)
     - Removed leftover call to gnome_theme_init
     - Support localised key names
     - Clean up sorting to not use an imaginary column
     - Avoid warnings when clearing at exit
     - Added missing GConf key
     mouse:
     - Dont crash if the glade file is not available
     network:
     - Plug memory leaks
     sound:
     - Polypaudio->PulseAudio renaming
     - Added a11y label relations for the devices tab
     theme switcher:
     - Fix compiler warnings
     - Fixes on the suffix checks
     - Pass correct order of arguments to gnome_vfs_xfer
     - Listen for changes in the gtk-color-scheme property of GtkSettings
     typing break:
     - Use specific string as app ID in gnome_program_init
     - Use compositing to display the typing break window when available
     ui properties:
     - Plug memory leaks
     - Change "Editable menu accelerators" to "Editable menu shortcut keys"
       as per the style guide
     windows:
     - Plug memory leaks
     fontilus:
     - Use GOption argument parsing
     - Fixed some leaks
     themus:
     - Port to GOption
     settings daemon:
     - Prevent crashes/assertion failures trying to set ridiculously high/low
       volumes
     - Fixed property names
     - Dont install the same window filter twice
     - Make sure we have a key event before treating it as such
     - Fixed leaks
     - Round volume instead of truncating on umute so a simple mute/unmute
       doesn't lower the volume (Ubuntu: #81203)
     - Make the new volume overlay window follow the icon and color themes
     - Eat media player keys if someone is listening on the bus interface
       already
     - Revert to the old font path if the new one could not be set
       (Ubuntu: #2066, #52163, #79566)
     shell:
     - Prevent capplets from being launched twice
     - Use correct GConf prefix
     - Added default common tasks
     - Respect the exit_on_close flag
     - Added a flag controlling display of GenericName's
     - Fix typo in usage string
     - Respect the --disable-schemas-install configure flag
     - Dump remnants of gstreamer-0.8
     - Use custom gnomecc.menu instead of settings.menu
     - Dont show Help menu if help is not available
     - Disable package management/main-menu items in the context menu
       (Ubuntu: #81335)
     - Use correct text color when highlighting
     - Use ...