https://bugzilla.kernel.org/show_bug.cgi?id=106291
--- Comment #8 from universaledge97@gmail.com --- It turned out that the amdgpu kernel module was not included in compilation. I normally use the linux-mainline package from the AUR (I run Arch Linux) to install rc kernels, where, for some reason, the amdgpu module was not enabled to compile by default. I now have amdgpu built into 4.3rc7, and will report back if the issue is still present.