Lenovo ThinkPad 770Z TP 770X User's Reference that shipped with the system - Page 91
Fn+F7, doing overlay playback
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Attaching an External Monitor If you want to show DOS full screen, only primary CRT or TV becomes DOS full screen modes, secondary (LCD) becomes blank. If you play the video clip (AVI or MPEG file) on the CRT or TV, the image is in overlay mode. On the other hand, on the LCD, the playback will be a software drawing. An application using the DirectDraw or the Direct3D is shown only on the primary display (LCD) when it is played with full screen mode. You cannot use the Fn+F7 (display switching) function and Fn+F8 (screen expansion) when you are in the dual display mode. DVD movie cannot be played back if you use the dual display function. To playback it, disable the function before playing back a DVD movie. Disable the dual display function before you disconnect a CRT or a television. The followings are the settings that you are not supported when doing overlay playback: LCD 1024x768, 256 1024x768, 65K 1024x768, 16M 1280x1024, 256 1280x1024, 64K CRT or TV 1024x768, 16M 1024x768, 16M 1280x1024, 64K 800x600, 64K 1024x768, 256 or 64K 1280x1024, 256 or 64K 1024x768, 64K 1280x1024,256 Chapter 2. Extending the Features of Your Computer 77