does disabling KMS help? at grub press 'e' to edit. add 'radeon.modeset=0' to the end of the kernel line, and ctrl+x to boot
maybe related to Bug #601376 -- [drm:radeon_dvi_detect] *ERROR* HDMI Type A-1: probed a monitor but no|invalid EDID https://bugs.launchpad.net/bugs/539851 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
