Multimedia video on netbook

[jack craig]

Hi Folks,

I just loaded VLC on my netbook and was able to view my recent manta ray 
night diving video.

However, given its normal power saving procedure, it dims the screen 
shortly after the video starts.

Is there any prevailing wisdom how to handle this feature during a video 
display?

I am assuming watching movies has the same issue...

tia, jackc...