This little bash script prioritize the smooth view of a fullscreen application preventing screen shutdown, start of screensaver and suspends boinc projects untill the window goes out of fullscreen.
It has to be put as a startup application (it must use a command like sh ~/fullscreen-daemon.sh) and runs as a daemon, under gnome desktop environment version 2 and 3.
UPDATE 2011/05/29: The script is tested under gnome 3 but should work as it has always done under gnome 2
Furthermore, in case of a fullscreen video, if it is still choppy there might be a workaround to play smoothly fullscreen:
sudo mkdir /etc/adobe echo "OverrideGPUValidation=true" >~/mms.cfg sudo mv ~/mms.cfg /etc/adobe/