Hello all, it's been a while since I've been here
I took the plunge and instaleld a clean install of Ubuntu 12.04 on my old PowerPC iMac G5. When I installed it, it couldn't even get to the login screen. I added radeon.agpmode=-1 as a Yaboot argument and now I can get to the desktop with full resolution. Through some twists and turns I have managed to get Wifi, Bluetooth, and sound running perfectly as well. What doesn't work is graphics aceleration.
When I open the Aditional Drivers icon in the System Settings an alert pops up that says, "Search for additional drivers" and then closes after 1-2 seconds. Nothing pops up after that. I have a 'ATI Radeon X600 XT' according to it's specs sheet from Apple.
Unity 2D and Gnome Classic w/ no effects works great, but I HTML5 videos play at 1 FPS and 3D games are unusable. I would really like to get acceleration working but I can't figure out how. Any help would be much appreciated