Hello lovely Manjaro people. You have taught me much, but here’s one I just can’t figure out alone.
I can’t get Darktable to recognise my AMD GPU for OpenCL acceleration. Much has been written about this issue here and elsewhere – I’ve done my reading & followed various strategies that have worked for others, but none have for me 
Any ideas would be much appreciated.
My system: Ryzen 3600, 32gb ram, GPU = ASUS HD 7770 (2 GB, southern islands, GCN 1.0).
OS is Manjaro Minimal XFCE, with kernel 5.10.49-1.
Other folks seem to have had the most success by combining the kernel amdgpu driver and OpenCL-AMD package from the AUR. For many, this seems to be enough. To make this work, I have also installed the AMDGPU-experimental package from the AUR, which forces use of the AMDGPU driver over the older radeon one and claims to offer some Southern Islands support.
This much works as intended: clinfo recognises the GPU (can provide readout if needed) and everything looks set to go. However, although darktable-cltest recognises the device and acknowledges image support, it then fails upon reporting: [opencl_init] could not create command queue for device 0: -6
I’ve also tried the ROCm and full AMDGPU-Pro routes as suggested on archwiki, but both failed to get me even as far as the above.
I feel like I’m on the cusp, but have reached the limits of my competence. I don’t want to switch distros if at all possible – I love the manjaro life! Your help is much appreciated.