When the MythTV frontend is full screen, the taskbars and/or Unity is still visible. How can I hide them?
For 11.04 and newer
sudo apt-get install compizconfig-settings-manager from a terminal (CTRL+ALT+T), then run it from the dash, just open dash and type ccsm and then goto the Unity plugin and in there you can choose panel opacity to 0. It's the best I can suggest without disabling compiz, and therefore unity.
Install compizconfig-settings-manager using the following command.
sudo apt-get install compizconfig-settings-manager
Go to Ubuntu Unity plugin and set the option for Hide launcher to auto-hide. Then, go to Workarounds and check the box for the option Legacy Fullscreen Support.
This method worked for me in 11.04.