Sony PCG-838 - Manual (Page 39)

Using Your Notebook Computer 29
To play DVD-ROMs
To achieve optimum performance when playing DVD-ROMs, you should
use the following recommendations: Your computer should not
be connected to the docking station while playing DVD movies or using
DVD applications. Close any open applications before playing a
DVD-ROM movie. The DVD player automatically adjusts the screen
properties when you play a DVD movie. Depending on the display setup
properties you have selected, you may need to use the Fn + F command
to expand the movie to full screen size.
✍
When playing DVD movies on battery power, set the power management profile to
Maximum Performance. With other profiles, the movies are choppy.