On Kubuntu 12.04 i have noticed that VLC does not prevent my backlight from dimming when watching a movie in fullscreen on battery.
I have the following enabled in the advanced preferences:
Inhibit the power management daemon during playback
Which works to some extent since the laptop does not go into suspend/hibernation. However, the screen still dims and i have to stay moving the mouse to make it bright again. Dragon player does not suffer from this issue so i assume its a problem with vlc.
Does anyone have an idea of what I need to do to fix this?