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I had the same issue - though in my case I'm running a Skylake i7-6700 CPU
Logged in under normal Gnome X Server i also had the issue that in the display applet my monitor was not detected correctly (showed as unknown) and I could not change the resolution (only one resolution shown)
in a terminal running 'glxinfo | grep OpenGL' the output showed: renderer = Gallium 0.4 on llvmpipe (LLVM 3.7, 256 bits) rather than: renderer = Mesa DRI Intel(R) Skylake DT GT2
Hunting around I eventually resolved this by updating grub to include 'i915.preliminary_hw_support=1'
i.e in a terminal run:
Note: after the above my monitor was correctly detected and i could change resolution as well