I encountered the same issue just a moment ago.The possible reason i think is that the monitor was not connected to computer well while it booted with no problem.This reason may lead to crash frequently.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1409393 Title: radeon GPU lockup CP stall To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1409393/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
