How to change Graphics Driver in 16.04 from i915 to open source driver?

I was finally able to fix the i915 problem by updating from kernel 4.4.0-22 to 4.5.1. On my 64 bit machine with ubuntu 16.04 xenial I ran:

    % wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5.1-wily/linux-headers-4.5.1-040501_4.5.1-040501.201604121331_all.deb

    % wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5.1-wily/linux-headers-4.5.1-040501-generic_4.5.1-040501.201604121331_amd64.deb

    % wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5.1-wily/linux-image-4.5.1-040501-generic_4.5.1-040501.201604121331_amd64.deb

    % sudo dpkg -i *.deb

DEAR UBUNTU DEVELOPERS, the DRM issue with i915 appears to be fixed as from kernel version 4.5.1. I tried version 4.4.10 and it did not fix the DRM issue. I would appreciate if the changes to DRM in connection with i915 were backported into the official xenial kernel.