Alright! First, I appreciate the help with this.

I decided to just roll with what I was being given and roll the kernel after
applying the patches you'd recommended. I downloaded the newest unstable source
this morning from here: git://kernel.ubuntu.com/ubuntu/unstable.git

did a make menuconfig to make sure that amdgpu.dc was included, along with
custom processor flags for new core2/xeon processors, and then applied the
patches you'd mentioned. Sadly, neither of them were verbatim because I've
taken too long to get back to working on this, so I had to apply them manually.

You'll find my diff patches attached. Nothing overtly different.

I'm going to start compiling this, and then go to lunch. Thanks!