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It turns out that the Kernel upgrade was a red herring -- the issue was the secure boot upgrade that happened at the same time, which blacklisted the NVidia drivers. This is essentially the same issue as found here: Ubuntu 16.04 kernel 4.4.0-21 not loading nvidia/vboxdrv modules anymore (Required key not available) Confirmed by running $ sudo modprobe -v ...


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I resolved the issue. Although I attempted a manual uninstall of the manually installed 361 driver, it failed to clean-up all the shared objects and so what I was experiencing was essentially a library problem. After purging all NVIDIA packages using apt, I resolved this as follows: Locate all the 361 driver shared object files using (excludes any trash ...


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On http://packages.ubuntu.com/ you can search for packages containing a file. For X11/extensions/Xcomposite.h that finds libxcomposite-dev


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One suggestion is to try xscreensaver: sudo apt-get install xscreensaver On my own system I have had more reliable power saving / powering down / blanking with this application. A screenshot from my own Xenial system to demonstrate the power management options: And as a bonus there are some truly amazing screensavers...



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