The same behaviour is observed on my iMac system when I boot archlinux (kernel 3.4.4) on another partition. In that case I needed to set 'radeon mode=0' in the modules.conf file to allow me to see anything on the main screen, even text. The default setting was mode=1.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1024507 Title: 12.10 quantal boots to black screen on iMac To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1024507/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs