QGIS OpenCL settings fall back to onboard-graphics

Question

I am running QGIS 3.4.14 on my Mac 16', with a Radeon 5500 GPU. I've enabled the OpenCL support in QGIS settings as well as my user profile settings.

It offers me the CPU, the built-in oonboard GPU Nvidia 630 as well as the Radeon 5500. Unfortunately, when selecting the Radeon and shutting QGIS down and start it again it always selects the NVIDIA and not the more powerful Radeon.

Is it a bug or a feature?

Answer 1

I'm experiencing a similar behaviour with QGIS 3.22.1. However in ~/Library/Application Support/QGIS/QGIS3/profiles/default/qgis.org/QGIS3.ini OpenCL setting persists app restart and won't change until one presses "OK" in Preferences window.

OpenClDefaultDevice=AMD Radeon Pro 5500M Compute Engine|AMD|OpenCL 1.2 |GPU
OpenClEnabled=true

So this may be an interface issue.