Toshiba Satellite P50-B - Manual (Page 88)

To open the Screen Resolution dialog, click Desktop Assist -> Control
Panel -> Appearance and Personalization -> Display -> Change
display settings on the desktop.
If you are running some applications (for example a 3D application or video
playback), you may see some disturbance, flickering or frame dropping on
your screen.
If that occurs, adjust the resolution of display, lowering it until the screen is
displayed properly.
User's Manual 4-42