Hi Lee, I can report that it works on my Mac mini. One difference might be that I use a monitor, Nokia 400 Xa, that can provide its supported refresh rates etc., the TV perhaps cannot. Another reason could be the new feature in kernel, KMS, that I have disabled, by adding a file: /etc/modprobe.d/radeon-kms.conf with contents: options radeon modeset=0 That's definitely worth a try. Risto