One further historical detail: when these machines were running 14.04.3 and we made the mistake of accepting the HardWare Enablement (HWE) upgrade:
https://wiki.ubuntu.com/1404_HWE_EOL which replaced the old fglrx driver with the radeon one, that's when we first encountered this unable-to-unblank problem. Fortunately, at that time we were able to roll back Xorg to 1.16 and keep things sort-of working: https://askubuntu.com/questions/815591/ubuntu-14-04-5-16-04-and-newer-on-amd-graphics https://askubuntu.com/questions/676216/downgrade-xorg-server When we performed a clean, full re-install with 16.04 we were hoping this problem would be resolved, but as I've documented here it continues to affect the systems. -- 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 ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
