When using Maniaplanet/Trackmania(any title) in fullscreen mode and if I don't touch the mouse or keyboard (I use a gamepad), screensaver or the monitor powersave mode will kick in anyway, as they do with any windowed application but don't with other games or media played in fullscreen (VLC, Youtube, etc.)
How to reproduce it:
- set the screensaver to 1mn
- launch maniaplanet in fullscreen mode
- wait 1mn without doing anything... There is the screensaver!

As Written here, I've deleted Config/Default.SystemConfig.Gbx but the problem is still there.
For investigation if needed, I attacheded my DxDiag.txt and if needed, I would gladly send any other relevant info for debugging this.