Vulkan + NVidia 940mx + Intel integrated GPU doesn't work

[Chaosphere]

Hi there,

First, excuse me for my poor english because I’m not native (i’m french)…
I’m going to try to tell what my problem is.

My configuration :
Asus laptop X556U
Ubuntu 10.10
GPU : Intel integrated GPU + Nvidia GeForce 940mx
Driver : nvidia-driver-440 (free)

I installed the Vulkan SDK in my home dir in : /home/seb/vulkan-sdk
I put in my .profile file :

source /home/seb/vulkan-sdk/1.1.126.0/setup-env.sh

Then, I created the file /etc/ld.so.conf.d/vulkan-libs.conf wich contains :

seb@seb-X556UQK:/etc/ld.so.conf.d$ cat vulkan-libs.conf 
/home/seb/vulkan-sdk/1.1.126.0/x86_64/lib

Then I did :

sudo ldconfig

In the NVidia configuration panel, in PRIME profile I selected “NVIDIA (Performance mode)”

If I launch vkcube, a black window appears (there is no rotating cube)

If I try vulkaninfo, it says the following :

WARNING: [Loader Message] Code 0 : loader_icd_scan: Can not find 'ICD' object in ICD JSON file /usr/share/vulkan/icd.d/nvidia_layers.json.  Skipping ICD JSON
/home/seb/vulkan-sdk/1.1.126.0/source/Vulkan-Tools/vulkaninfo/vulkaninfo.h:803: failed with ERROR_INITIALIZATION_FAILED

In the NVidia panel if I switch to “Intel (Power saving mode)”, reboot,

vkcube now works, it shows a rotating cube in a window

vulkaninfo now says a lot of things :

WARNING: [Loader Message] Code 0 : loader_icd_scan: Can not find 'ICD' object in ICD JSON file /usr/share/vulkan/icd.d/nvidia_layers.json.  Skipping ICD JSON
...
...
Presentable Surfaces:
=====================
GPU id : 0 (Intel(R) HD Graphics 620 (Kaby Lake GT2)):
...
...

(but there is no NVidia GPU)

If I delete /usr/share/vulkan/icd.d/nvidia_layers.json, the WARNING message doesn’t appears anymore but vulkaninfo still doesn’t show my NVidia GPU and vkcube still doesn’t show the rotating cube

Is it normal that a nvidia_layers.json file is in the icd.d directory ?

here is the content of :

• /usr/share/vulkan/icd.d/nvidia_icd.json :
  {
  “file_format_version” : “1.0.0”,
  “ICD”: {
  “library_path”: “libGLX_nvidia.so.0”,
  “api_version” : “1.1.99”
  }
  }

• /usr/share/vulkan/icd.d/nvidia_layers.json :
  {
  “file_format_version” : “1.0.0”,
  “layer”: {
  “name”: “VK_LAYER_NV_optimus”,
  “type”: “INSTANCE”,
  “library_path”: “libGLX_nvidia.so.0”,
  “api_version” : “1.1.119”,
  “implementation_version” : “1”,
  “description” : “NVIDIA Optimus layer”,
  “functions”: {
  “vkGetInstanceProcAddr”: “vk_optimusGetInstanceProcAddr”,
  “vkGetDeviceProcAddr”: “vk_optimusGetDeviceProcAddr”
  },
  “enable_environment”: {
  “__NV_PRIME_RENDER_OFFLOAD”: “1”
  },
  “disable_environment”: {
  “DISABLE_LAYER_NV_OPTIMUS_1”: “”
  }
  }
  }

• With those following drivers there is no nvidia_layers.json in /usr/share/vulkan/icd.d/ :
  nvidia-driver-430 (proprietary)
  nvidia-driver-390 (proprietary)

But vkcube doesn’t work with my NVidia GPU and vulkaninfo only show my Intel integrated GPU

Is someone could help me please ?