I've been suffering this problem on my new iMac 21.5 (11,2 i3, Radeon 4670). All linux live CDs would give black screen even though I could hear the disc loading up.
I've got round the problem for my system by doing two things: 1 connecting an external monitor through the Mini Display port. 2 Using F6 on the grub boot menu to add options - radeon.modeset=0 nomodeset I don't know if the radeon modesetting works on the external monitor (LG1710, has worked OK on a Mac Mini but will test it on iMac) but it certainly doesn't work on the main monitor. I've only tried live CDs so far; in 'xrandr' the main monitor is identified as eDP-0 and it lists the full range of supported resolutions up to 1920x1080. -- Imac Radeon HD 4850 switch "Mini Display Port" output during install resulting black screen https://bugs.launchpad.net/bugs/597070 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
