I'm using VLC to watch movies.
I just realized that the system goes on screen saver mode event when I'm watching a video in full screen mode with VLC (I think it was not the case last week and it might have been induced by the last updates).
Is there any trick to go around that ? (the screensaver option are so few...)
Yes, but I believe that it is supposed to be enabled by default. The OP can check if it is enabled by going to tools > preferences and then in show settings select "all". Then scroll down and click on video and the on right check if it is enabled.