You would likely know if you are using the Pro driver. It usually have to either install the driver from AMD, or by a repository specifically for it.

It is possible to get GPU based processing using the open source driver. You need a HiP based card, like the RX 6600. Exactly how the necessary driver is installed depends on your distro.

Grepping the loaded modules could give some clue:
`$ lsmod |grep -i amd`

For comparison: On my amdgpu (discrete RX) and Intel CPU-integrated VGAs I get:
```
lsmod |grep -i amd
amdgpu 8208384 1
drm_ttm_helper 16384 1 amdgpu
iommu_v2 24576 1 amdgpu
ttm 86016 3 amdgpu,drm_ttm_helper,i915
gpu_sched 53248 1 amdgpu
i2c_algo_bit 16384 2 amdgpu,i915
drm_dp_helper 159744 2 amdgpu,i915
drm_kms_helper 192512 3 drm_dp_helper,amdgpu,i915
drm 618496 26 gpu_sched,drm_dp_helper,drm_kms_helper,drm_buddy,amdgpu,drm_ttm_helper,i915,ttm
```

Run

If you don't see mesa mentioned, them you're definitely running Pro drivers for everything.

Bear in mind that if you only need OpenCL from the pro drivers, you can get that by running the installer with "--headless" as argument.

ROCm is a better option for AMD OpenCL under Linux.

Also, at this point the AMDGPU Open driver is pretty much as good as the AMDGPU Pro driver. The Mesa driver still tends to be faster, than either for the purpose of gaming.

It's noted that the AMDGPU Pro driver might be better for certain workstation use, and scientific use. This is it's main purpose these days.

Oh, little warning for everyone on Arch, Gentoo and other Distros with custom build flag support. Be careful with custom build flags on LLVM for the purpose of improving OpenCL performance. Such settings can cause problems elsewhere.

As of knowing which OpenGL stack you are running, type "glxinfo -B" in any prompt. It will tell you your GL Stack info and some other base info about it.

(Edit: capital "-B" lowercase gives best visual ID, which isn't what you want.)

p.s. "glxinfo -t -l" gives tons of good info.

for scientific use you rarely need to install the entire AMDGPU PRO driver

usually what's required is just OpenCL, which can be installed from the PRO driver installer in "-headless" mode and thus just adding the OpenCL component to the current system without replacing Mesa with AMDGPU PRO

check this thread for a little more details:
https://steamhost.cn/steamcommunity_com/app/221410/discussions/0/1862742067789070076/