I can confirm the bug is fixed on today's Vivid daily image. I was able to boot and play in the live session. I verified the radeon driver with kernel mode setting was in use.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1386973 Title: Ubuntu 14.10 soft lockup with ATI Radeon R7 250 X To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1386973/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs