While logged in via ssh to the machine with the "hung" Xorg (screen blank, no way to recover except Alt-SysRq-k), I dumped the output of Alt-SysRq-t into the syslog -- see attached file. Not sure this is much use, however. Just trying to be complete while I'm on-site with a hung machine.
** Attachment added: "syslog with output from Alt-SysRq-t in ssh session" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1763273/+attachment/5117347/+files/syslog -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763273 Title: kernel panic in Radeon driver while screen blank To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763273/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs