I'm looking at the installation instructions for 10.6 now (www.amd.com then navigate to Desktop Graphics drivers for Radeon HD5xxx Linux) and the instructions say :
/usr/bin/aticonfig for Xorg 7.x
/usr/X11R6/bin/aticonfig for earlier versions of Xorg
/usr/bin/aticonfig for Xorg 7.x
/usr/X11R6/bin/aticonfig for earlier versions of Xorg
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