I have ubuntu 14.04 64bit running vlc 2.1.2 and xscreensaver installed from the software center. (Gnome screen-saver is not installed.) Whenever I play a video in fullscreen in vlc the screensaver comes on. I have the option "inhibit the power management daemon during playback" checked and "disable screesaver" checked but the screensaver still comes on. I upgraded from 13.10 64bit ubuntu and uninstalled vlc and reinstalled it but the screensaver still comes on.
I reset my vlc config file by deleting it and starting vlc again to recreate
http://www.videolan.org/support/faq.html Linux / Unix: $(HOME)/.config/vlc/vlcrc (v0.9.0 and above),