adding "radeon.modeset=0" (thus disable radeon KMS) to kernel options in /boot/grub/grub.cfg will fix the problem
menuentry 'Ubuntu, with Linux 2.6.32-21-generic' --class ubuntu --class gnu-linux --class gnu --class os { recordfail insmod ext2 set root='(hd0,2)' search --no-floppy --fs-uuid --set 7cc5b473-d68d-41fa-a0f2-38041f11ef5a linux /boot/vmlinuz-2.6.32-21-generic radeon.modeset=0 root=UUID=7cc5b473-d68d-41fa-a0f2-38041f11ef5a ro quiet splash initrd /boot/initrd.img-2.6.32-21-generic } -- Never winter night not displaying characters https://bugs.launchpad.net/bugs/572748 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