Description:
When settings are changed in gconf-editor, the system ignores those changes. 
(example of changing preferred player for autoplay_DVD)

On a clean Ubuntu Hardy Beta installation follow these steps:

1) Install the VLC player with "sudo apt-get install vlc"
2) Start the gconf-editor as root with "gksudo gconf-editor"
3) Go to the following section: desktop>gnome>volume_manager
However, do not expand that menu, select the top of that menu (so actually 
click on "volume_manager"
4) In the Key value window (the right window of the tool) scroll down to the 
value "autoplay_dvd_ command"
5) Right click the key value to the right of its name and select "edit"
6) Enter the new value /usr/bin/vlc dvd://
7) Select "Ok"
8) Right click the field again and select "Set as Default"
9) Do the same for the key "autoplay_vcd_command"
(I have tested these settings with both autoplay_dvd and autoplay_vcd checked 
and unchecked with the exact same results!)

10) Close gconf_editor.
11) Put a movie DVD in your DVD player and watch to see which application is 
being used by the system to play the movie.

Result:
You've guessed it: Totem is launched and plays (or rather: doesn't play) the 
movie.

Expected result:
Since gconf_editor is the only means we have in the Gnome desktop environment 
to change these values I would expect the system to respect the changes I've 
made and use my newly defined favorite DVD movie player when I enter a DVD 
movie, instead of ignoring it and launching the default one.

Note:
Technically speaking, in Ubuntu it is now impossible (don't know about manually 
editing config files, but I don't think that matches the Gnome philosophy to 
keep things simple for the user) to changed preferred applications. The only 
means that exist that actually allow you to change something is the Preferred 
Applications tool under System>Preferences. Low and behold, the old tab that 
allowed one to define these type of preferences has been removed.

In the end, the user is stuck with the predefined settings and cannot
change them.

I would consider this a pretty big flaw in the system. Simplicity is one
thing, but not allowing a user to customize his preferences at all, is
another. This cannot enter into the live version because it will tick
quite a few people off that they get their hands tied to their back by
the system this way.

Good luck with the bug!

-- 
Hardy: gconf-editor changed settings ignored by system
https://bugs.launchpad.net/bugs/203877
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