Comment 9 for bug 1589008

I'm also suffering from this same problem. Just tested with 4.7-rc6 (released today), and the problem has been resolved.
(There are other issues I'm experiencing with this kernel, so I will boot back to 4.4)

@Stephen, installing another kernel alongside your existing one is rather easy, and does not require wiping your computer or a fresh install. I followed the guide here: https://wiki.ubuntu.com/Kernel/MainlineBuilds?action=show&redirect=KernelMainlineBuilds#Installing_upstream_kernels_.28manually.29, and then when I rebooted my computer, chose advanced options for Ubuntu, and chose the kernel I wanted. Going back to the original kernel is one reboot away.

@Joseph, do you happen to know if/ when 4.7 is scheduled to be released?