Try this:
From:
http://www.serenux.com/2009/04/howto-fix-mythtvs-frontend-not-going-full-screen-in-ubuntu-jaunty/
Go to System->Preferences->CompizConfig Settings Manager. If you do
not have this option in your Preferences, then you need to add it.
Quickly jump into a terminal and type in at the $ prompt:
$ sudo apt-get install compizconfig-settings-manager
…and hit Enter. Once installed, go back into the Preferences menu and bring
it up.
Scroll down until you get to the “Utility” section and then click on
“Workarounds”. It should alredy be selected as enabled, but if not, also make
sure the checkbox next to it is enabled too.
.
The window changes to show you the Workaround options. The very first
option is “Legacy Fullscreen Support”. This is unchecked by default. Click on
the checkbox so that it IS checked, and then click on the Back button, then
close the window.
.
Quit the MythTV Frontend if you had it open already and then restart it.
You will now find that the gap has disappeared, and that the MythTV display is
now appearing full-screen properly instead of just being a window.
.
Pat yourself on the back.
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https://bugs.launchpad.net/bugs/348934
Title:
MythTV doesn't go full screen without desktop visual effects off
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