Disclaimer : what I did concerns 4.15.0 kernel only, on Intel machine (Assus Zenbook pro, x86_64, model: UX410UAR)

Hello,

Sorry for coming late, but I had the same issue some days ago (never tested before):something like  Guc not loading, while Huc did. Of course I hit this page, and some other without find a complete solution.

**But** after one day searching, I finaly make it work (!!) , and I'll try to explain what I did (I do not recommend to do the same, but I'll attach a patch (under MIT license, or whatever you need, just ask).

The problems: 

1. when you download the kbl_guc_ver9_14.bin blob from Intel site, looks like the downloaded file is an .xml file in fact, but not a binary at all. Maybe the site has an issue ? (sorry, not a website specialist)  // Can someone verify btw ?
 
2. IIRC Intel made kbl_guc_ver9_xy.bin for Kabylake, and I simply tried to make the kbl_guv_ver9_39.bin work.   

Important: I found kbl_guv_ver9_39.bin blob there :  http://archive.ubuntu.com/ubuntu/pool/main/l/linux-firmware/


What I did : 

- I extracted kbl_guv_ver9_39.bin from linux-firmware_1.178_all.deb, and put it in /lib/firmware/i915

After that, I downloaded the most recent 4.15.0 kernel sources (on my LinuxMint 18.3) :

=>  apt-get source linux-source-4.15.0 provided :

Réception de :1 http://ubuntu.mirrors.ovh.net/ftp.ubuntu.com/ubuntu xenial-updates/main linux-hwe 4.15.0-47.50~16.04.1 (dsc) [6 511 B]
Réception de :2 http://ubuntu.mirrors.ovh.net/ftp.ubuntu.com/ubuntu xenial-updates/main linux-hwe 4.15.0-47.50~16.04.1 (tar) [158 MB]

After I downloaded the sources, I copied initrd.img-4.15.0-34-generic as .config in the kernel tree, and I simply patched the following files (in drivers/gpu/drm/i915 : 
- intel_guc_fw.c
- intel_uc.c

Comments :
- In the first one, I simply modified the binary version (changing KBL_FW_MINOR from 14 to 39)
- In the second one, I followed Robert M. Fosha advice (link : https://patchwork.kernel.org/patch/10877903/), allowing to avoind timeout and retry when trying to load the blob

=> see the attached patch.

For the record, my current /etc/modprobe.d/i915.conf contains :

````
options i915 enable_fbc=1 fastboot=1 enable_guc_loading=1 enable_guc_submission=1


````

 
Next step was to build the kernel, the Debian way (using make -j8 deb-pkg), and after installing the debs, I got everything working at the end, including the 9_34 version of kbl_guc blob :-) :

````
me@MyMachine ~ $ dmesg | grep i915
[    2.018994] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    2.019493] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_01.bin (v1.1)
[    2.031452] [drm] HuC: Loaded firmware i915/kbl_huc_ver02_00_1810.bin (version 2.0)
[    2.041847] [drm] GuC: Loaded firmware i915/kbl_guc_ver9_39.bin (version 9.39)
[    2.058753] i915 0000:00:02.0: GuC submission enabled (firmware i915/kbl_guc_ver9_39.bin [version 9.39])
[    2.059299] [drm] Initialized i915 1.6.0 20171023 for 0000:00:02.0 on minor 0
[    2.519645] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    9.408643] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])

````

Conclusion : we can use kbl_guc_ver9_34 with 4.1.5.x kernel. Not sure it is perfect, but 

"# cat /sys/kernel/debug/dri/0/i915_huc_load_status"  returns : 

````

HuC firmware: i915/kbl_huc_ver02_00_1810.bin
	status: fetch SUCCESS, load SUCCESS
	version: wanted 2.0, found 2.0
	header: offset 0, size 128
	uCode: offset 128, size 218304
	RSA: offset 218432, size 256

HuC status 0x00006080:
````

And  "# cat /sys/kernel/debug/dri/0/i915_guc_load_status" returns: 
````
GuC firmware: i915/kbl_guc_ver9_39.bin
	status: fetch SUCCESS, load SUCCESS
	version: wanted 9.39, found 9.39
	header: offset 0, size 128
	uCode: offset 128, size 147392
	RSA: offset 147520, size 256

GuC status 0x800330ec:
	Bootrom status = 0x76
	uKernel status = 0x30
	MIA Core status = 0x3

Scratch registers:
	 0: 	0xf0000000
	 1: 	0x1
	 2: 	0xfede7000
	 3: 	0x5f5e100
	 4: 	0x600
	 5: 	0xcdfd3
	 6: 	0x0
	 7: 	0x8
	 8: 	0x3
	 9: 	0x70240
	10: 	0x0
	11: 	0x0
	12: 	0x0
	13: 	0x0
	14: 	0x0
	15: 	0x0
````

Last but not least, thanks to Intel people for their work : the HD 620** UHD works very well with mesa 19.1 devel / vulkan 1.1 !

(inxi -G returns  Card: Intel UHD Graphics 620)

-- 
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