First we delete the entry for the standard X server
* Click on the standard server that appears in the "Servers to Start" list
* Click the "Remove Button"
Now we create a new entry for the Xgl server
* Click the "Add/Modify" button
* Set the new server to use "VT 1". Use "Standard" for the "Server" option - this indicates which profile to use for the server, ideally we could create a new "Xgl" profile here but at the present time we cannot create a new profile using gdmsetup, so we'll just modify the settings for the "Standard" profile. Don't enter any options here. Click "Ok" when done.
* Under "Server Settings" change the "Server Name" to "Xgl"
* Enter your Xgl command in the "Command" box, for example, ati users would type:
/usr/bin/Xgl :1 -ac -accel xv:pbuffer -accel glx:pbuffer