Optimus laptop about obs-vkcapture

[nowrep]

It requires VK_EXT_external_memory_dma_buf which is currently unsupported in NVIDIA proprietary driver.

[nowrep]

Actually I am not sure if this is Optimus specific or just NVIDIA proprietary driver not supporting the required extensions to get dmabuf from vkmemory/eglimage/xpixmap.
I've only myself tested it on AMD.

[arrowgent]

for optimus its often recommended to use some enviornment variables to prevent GLX/VK being loaded on the intel gpu

export __NV_PRIME_RENDER_OFFLOAD=1
export __GLX_VENDOR_LIBRARY_NAME=nvidia
export __VK_LAYER_NV_optimus=NVIDIA_only
export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-0

same issue happens in steam-proton for example.

YMMV, and im sure you can search for the nvidia manual what those settings do exactly

i specifically use nvidia-prime to force the d-gpu (nvidia) to always be used
plus these enviornment variables.

[Leeo97one]

@arrowgent So does it work for you? You are able to capture an app rendered by the NVIDIA GPU on your Optimus laptop using obs-vkcapture?
I have already tried with PRIME Render Offload and also with a reverse/output PRIME setup (when everything is rendered on the NVIDIA GPU, the Intel GPU just displays the result).

[danyeet]

I tried a few days ago explicitly with the nvidia gpu and I just got dmabuf errors. Pretty sure there is missing driver support but if I am wrong please correct me. Also the upcoming 470 driver might fix it so be on the lookout. I got it working though with the intel gpu and it was running just fine.

[SmashleyG]

I am assuming my issues is the same. output complains about:

[obs-vkcapture] missing device extension: VK_EXT_external_memory_dma_buf

I have:
CPU: AMD 1920x Threadripper
GPU: nvidia rtx 3080 with nvidia drivers 460.73.01
Distro: PopOs 20.10

[nowrep]

Should be working now with 515.43.04 driver.