Comment # 11 on bug 95017 from erhard_f@mailbox.org

Also been hit by this bug on 2 of my 3 machines: PowerMac 7,3 (A1047) w. Radeon
9600 Pro and PowerBook 5,6 (A1106).

My PowerBook 5,8 (A1138) magically works with AGP! Which is interesting because
both the 5,6 and the 5,8 use a Mobility Radeon 9700.