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I am writing this question since I had no problem in years of using OpenCL with nVidia graphics in fedora and testing Darktable with it. But now in Fedora 27 I am trying to use Darktable with Intel Graphics opencl capability but when I do darktable -d opencl I get this response as it doesn't recognize:

Beignet: self-test failed: (3, 7, 5) + (5, 7, 3) returned (6, 7, 5)

and when I do clifo it winds three devices. I thought it should find only two, my CPU and my GPU. My CPU is Intel Core i7-7500U and that's it.

I have installed these packages: ocl-icd, opencl-filesystem, opencl-utils-devel and beignet. I think these cover all the necessary dependencies.

The question is: Is it possible to use Darktable's opencl capability with this GPU or not? and how can I do it using beignet and Fedora 27?

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This is a known bug with __local memory on beignet, see if this workaround works for you:

export OCL_IGNORE_SELF_TEST=1 
  • Thanks for the response, but unfortunately It doesn't fix the problem. Although it seems like the solution, I get the response which says: Intel(R) HD Graphics Kabylake ULT GT2' because the driver `OpenCL 2.0 beignet 1.3' is blacklisted. – M.Rez Jan 25 '18 at 16:16
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Beignet is blacklisted in darktable. You could try to remove it from the list and recompile darktable and see if it works: https://github.com/darktable-org/darktable/blob/master/src/common/opencl_drivers_blacklist.h Line 27. Darktable devs have disabled Beignet because they see not much gain in using intel cards with opencl. You can read more about it here: https://www.darktable.org/2012/03/darktable-and-opencl/

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