This is something that has been a pain since perhaps Ubuntu 20.04. Never bothered to look beyond the CLI solution until recently.

Expected behavior

Mouse button 5 is mapped to ‘F13’ and used as push-to-talk button for Discord.

Discord accepts the key and push-to-talk works.

Actual behavior

Gnome Settings panel is opened instead.

Solution

1. Install dconf Editor

   sudo apt install dconf-editor
   dconf-editor
   

2. Open conf-editor

3. Search for ‘control-center-static

4. Double-click and deslected ‘use default value’ and make sure ‘Custom value’ is set to [’’]

Alternative solution (not working)

gsettings set org.gnome.settings-daemon.plugins.media-keys control-center-static "['']"

This does not work in recent versions of Ubuntu? Since 20.04 potentially, based on one source.

Perhaps restart of Gnome or computer would make this work?

Bug?

This seems to not work when nothing is selected by just clicking on the Desktop. But selecting an application makes it work again. Some exceptions though it seems, such as Firefox and the Gnome Settings.

Make sure to always keep your Operating System(s) and all of the software that you are using up to date.

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kthxbai