UserAgent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0

Steps to reproduce the problem:
1. Add i915.enable_guc_submission=1 and i915.enable_guc_loading=1 to boot argument
2. 
3. 

What is the expected behavior?
GuC enabled with submission

What went wrong?
GuC is not enabled and there were no error logged (with drm.debug=0x2). 

cat /sys/kernel/debug/dri/0/i915_guc_load_status 
GuC firmware status:
	path: i915/skl_guc_ver6.bin
	fetch: SUCCESS
	load: FAIL
	version wanted: 6.1
	version found: 6.1
	header: offset is 0; size = 128
	uCode: offset is 128; size = 128640
	RSA: offset is 128768; size = 256

GuC status 0x800071ec:
	Bootrom status = 0x76
	uKernel status = 0x71
	MIA Core status = 0x0

Scratch registers:
	 0: 	0x0
	 1: 	0x90040
	 2: 	0x0
	 3: 	0x5f5e100
	 4: 	0x600
	 5: 	0x0
	 6: 	0x0
	 7: 	0x8
	 8: 	0x3
	 9: 	0x6aa00
	10: 	0x0
	11: 	0x0
	12: 	0x0
	13: 	0x0
	14: 	0x0
	15: 	0x0

Did this work before? No 

Chrome version:   Channel: n/a
OS Version: 4.4
Flash Version: 

I am not sure if this is skylake specific.

Loading GuC submission work with chromeos-4.14 and upstream 4.4.

GuC will load with i915.enable_guc_submission=0 and i915.enable_guc_loading=1 (submission disabled).

log: 
[    0.825875] [drm:intel_guc_setup] GuC fw status: fetch SUCCESS, load PENDING
[    0.928350] [drm:guc_ucode_xfer_dma] DMA status 0x10, GuC status 0x800071ec
[    0.928354] [drm:guc_ucode_xfer_dma] returning -110
[    0.928356] [drm] GuC fw load failed: -110; will reset and retry 2 more time(s)
[    1.030686] [drm:guc_ucode_xfer_dma] DMA status 0x10, GuC status 0x800071ec
[    1.030690] [drm:guc_ucode_xfer_dma] returning -110
[    1.030692] [drm] GuC fw load failed: -110; will reset and retry 1 more time(s)
[    1.133081] [drm:guc_ucode_xfer_dma] DMA status 0x10, GuC status 0x800071ec
[    1.133085] [drm:guc_ucode_xfer_dma] returning -110
[    1.133113] [drm] GuC firmware load failed: -110
[    1.133114] [drm] Falling back to execlist mode