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I am currently running Ubuntu 15.04 64-bit on a machine with a Radeon R9 270X GPU.

I've grabbed the latest 64-bit Linux build from this page (currently 2.75-a08f8a4) and I have installed the latest Catalyst drivers directly from AMD's website (currently 15.20.1046-150622a-186193C).

However, no matter what I do, I still don't see an OpenCL option anywhere in Blender's user preferences:

enter image description here

What am I missing or doing wrong?

Note: I tried setting the CYCLES_OPENCL_SPLIT_KERNEL_TEST=1 environment variable but it made no difference.

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  • $\begingroup$ Just a small thing to clarify - you do reboot Blender every time after some important changes (it may be not so important though; but still)? $\endgroup$ – Mr Zak Aug 19 '15 at 0:42
  • $\begingroup$ @MrZak yes, I restarted Blender and rebooted the computer after every change. $\endgroup$ – Nathan Osman Aug 19 '15 at 0:45
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AHA!

So it turns out that I needed the ocl-icd-opencl-dev Install ocl-icd-opencl-dev package installed. Once I installed that package...

enter image description here

\o/

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