In the kernel source I do see this:
drivers/gpu/drm/i915/intel_guc_loader.c
I see this define:
define I915_SKL_GUC_UCODE "i915/skl_guc_ver4.bin"
However, in lib/firmware
I see:
/lib/firmware/i915/skl_guc_ver1_1059.bin
It seems linux-firmware doesn't come with the bin file it expects. Btw, I am running Ubuntu 15.10. It seems we need to update the linux-firmware package?