I think the no 3d controller thing might just be how it is on amd/nvidia systems? it could also be a wayland thing I suppose. This is mine:
01:00.0 VGA compatible controller: NVIDIA Corporation GA104 [Geforce RTX 3070 Ti Laptop GPU] (rev a1)
Subsystem: ASUSTeK Computer Inc. Device 1b9c
Kernel driver in use: nvidia
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06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Rembrandt [Radeon 680M] (rev c7)
Subsystem: ASUSTeK Computer Inc. Device 1b9c
Kernel driver in use: amdgpu
which is working. Also notably, on laptops with nvidia dgpus, by default the nvidia gpu is always used for vulkan applications on arch. The only way to fix this is to manually define the default vulkan driver in .profile or something like that like this command for amdgpu.
export VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/radeon_icd.x86_64.json:/usr/share/vulkan/icd.d/radeon_icd.i686.json #Run Vulkan on AMD
then edit prime-run to use the nvidia-icd files when it’s called.
At least that’s how it was for both my current system (amd/nvidia) and last system (intel/nvidia).