User`s guide

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5: Troubleshooting
Enabling Overlay Planes
To enable overlay planes, follow these steps:
Note: The option to enable overlay planes only applies to the first channel on the pipe.
1. Edit the /etc/X11/XF86Config file to include the following line in each “Device”
section for which you want overlay planes enabled:
Option "OpenGLOverlay" "On"
2. Log out from the desktop, then log back in.
Example “Device” Section to Enable Overlay Planes
Section "Device"
Identifier "SGI SG-0"
Driver "fglrx"
BusId "PCI:23:0:0"
Option "OpenGLOverlay" "On"
EndSection