How to get OpenCL going with RX 6900XT on Ubuntu 20.04

[FriedrichGuenther]

Hey all,

i have a system consisting of an i9 9900K, an RX 6900XT and 32GB of RAM. This is meant to run OpenCL code for a university project and it would be very nice to get the graphics card involved. On the system there is a fresh install of Ubuntu 20.04 (if easier I don't mind switching distributions or reinstalling).

So far I have installed the latest proprietary driver as of writing (21.10) using

./amdgpu-pro-install -y --opencl=pal,legacy

and

ocl-icd-opencl-dev

and

clinfo

. The output of clinfo is

Number of platforms 1
Platform Name AMD Accelerated Parallel Processing
Platform Vendor Advanced Micro Devices, Inc.
Platform Version OpenCL 2.1 AMD-APP (3224.4)
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_icd cl_amd_event_callback cl_amd_offline_devices
Platform Host timer resolution 1ns
Platform Extensions function suffix AMD

Platform Name AMD Accelerated Parallel Processing
Number of devices 0

NULL platform behavior
clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) No platform
clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) No platform
clCreateContext(NULL, ...) [default] No platform
clCreateContext(NULL, ...) [other] No platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL) No devices found in platform

Is there anything I missed? Any help would be greatly appreciated.

[bridgman]

On the first line, you need to use "--opencl=rocr". Probably best to uninstall completely first.

[FriedrichGuenther]

Hey birdgman, wow, thanks a lot! That went off the rails quickly haha. Where could I have found this? On the AMD Installation Instruction page, the argument "rocr" is not mentioned if I am not mistaken.

Using your installation command worked, thanks a lot again!

[bridgman]

I'm not sure what happened - we had updated the instructions to specify rocr instead of pal - but it seems like the changes got lost or reverted recently.

Apologies for the confusion and glad to hear it's working now.