This happens to me on an 16.04 installation as well (kernel 4.4.0-24-generic. Hardware is a pair of EVGA Titan X. I can switch to a terminal using Ctrl+Alt+1 and I grabbed the attached information from gdb over two separate runs.
The system hangup occurs every time I lock the screen and the monitors go idle. I don't see anything troubling in journalctl happening at the same time that I'm attempting to resume. ** Attachment added: "gdb-compiz.tar.gz" https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1301125/+attachment/4682478/+files/gdb-compiz.tar.gz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1301125 Title: Lock screen after idle time freezes unity To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1301125/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
