@seccanj , I have experienced this same issue and was able to solve with the same steps.
- install 16.04.1 - get intel-microcode from "unity" -> "additional drivers" - blacklist nouveau - $ update init-ramfs -u this resolves boot and shutdown lockup. however, I've accidentally updated the kernel twice after resolving it with these steps. and in both cases, even after uninstalling the new kernel [ even latest 4.4.0-53] the issue returns randomly on boot and even once on shutdown [I'm using Dell 7559 6700HQ] * also using acpi_osi="!Windows 2015" does not resolve this -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1530405 Title: NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kerneloops:814] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1530405/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
