Adding "nomodeset" in the option GRUB_CMDLINE_LINUX_DEFAULT of file /etc/default/grub and issuing the command update-grub solved the issue for me.
-- Xorg freeze drm radeon 'Faild to schedule IB' https://bugs.launchpad.net/bugs/588940 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
