When I boot the kernel via grub everything is fine, once the kernel is loading
there is only a black screen until X starts.

When I switch back to the VT (via Ctrl+Alt+F1) I still see everything from X,
except the mouse. When I switch back to X everything works fine again.

I am using current mesa-git and kernel 4.4-rc6.

glxinfo, dmesg, etc: can be found here:
https://gist.github.com/EoD/ecb3e28fc004d740daa1


This might be a duplicate of Bug 91202.