"NV-GLX" missing when using vulkan backend about mnn HOT 14 CLOSED

try https://devtalk.nvidia.com/default/topic/1027746/linux-graphics-debugger/xlib-extension-quot-nv-glx-quot-missing-on-display-quot-1-quot-/

maybe it's a driver bug

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or amonakov/primus#73

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maybe your compute have two GPUs ,one is intel another is Nvidia, program default use device 0 , Intel's GPU is device 0 ,and Nvidia's GPU is device 1 .please check this

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Thanks for the reply. The first two links don't help. I indeed have two GPUs, but both of them are NV's cards, the same model.

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sorry ,the log "Invalide device for support vulkan" twice, so maybe enumeratePhysicalDevices failed ,please modify const bool VulkanInstance::supportVulkan() function ,and print error code

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it's -3.
VK_ERROR_INITIALIZATION_FAILED = -3

so a vulkan driver compatible issue?

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try run vulkaninfo on terminal , is it success ?

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try export VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/nvidia_icd.json maybe the dir is not this ,please change this ,then relaunch ./backendTest.out

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vulkaninfo output:

# vulkaninfo 
Xlib:  extension "NV-GLX" missing on display ":0".
==========
VULKANINFO
==========

Vulkan Instance Version: 1.1.106

/home/lunarg/sdk-build/Vulkan-Tools/vulkaninfo/vulkaninfo.c:5523: failed with VK_ERROR_INITIALIZATION_FAILED

the json file is located at:
/etc/vulkan/icd.d/nvidia_icd.json

I tried:
export VK_ICD_FILENAMES=/etc/vulkan/icd.d/nvidia_icd.json

then ran ./backendTest.out， still no lucky with the same error

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if vulkaninfo works incorrect , another application will not work too.

Check if you have vulkan-intel installed, it may prevent Nvidia's vulkan driver from being detected

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following https://wiki.archlinux.org/index.php/Vulkan#Nvidia_-_vulkan_is_not_working_and_can_not_initialize

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your computer CPU is Intel desktop or Xeon ？ usually desktop CPU has an eGPU.

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https://devtalk.nvidia.com/default/topic/1044881/linux/vulkaninfo-vulkaninfo-c-3339-failed-with-vk_error_initialization_failed/

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that works for Fedora ,maybe it works on CentOS too, but maybe dnf is not exists on CentOS ,so try yum install that.

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