NOTE: older cards are supported, newer cards only partially

Compile kernel with DRM support.

emerge xf86-video-ati

TO /etc/make.conf add:

VIDEO_CARDS="radeon"

Then:

emerge mesa

In /etc/X11/xorg make sure you have:

Section "Device"
    Driver "radeon"
EndSection

Section "Extensions"
       Option "Composite" "1"
EndSection

Section "ServerFlags"
       Option "AIGLX" "On"
EndSection

Links

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