Re: Kernel upgrade causes video problems
To Check - Boot into the Old, known to work, KERNEL and see if there are any problems with graphics. It it works as before then, use the Working Kernel.
I suggest this to ensure it is actually the kernel issue and not the issue of having to reload the graphic drivers.
Yes you can file a BUG with Launchpad. [Before you report the bug ensure that it has not been reported first... if not then follow the necessary instructions to report the bug].
"Evolution is Nature's way of issuing upgrades."