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I,m a user like you and I try to learn every day, your question and my answer could be useful for future readers, sorry if this isn't useful for you.
According the clinfo output your GPU model is FirePro W7100, not WX7100 (Radeon Pro)
Which driver have you installed? 18.Q4 or 18.Q3?
According the AMD Drivers & Support webpage for FirePro W7100 18.Q4 driver isn't recommended for Ubuntu 18.04.1 totally upgraded
this means that you need the 18.Q3 driver
When you are in Drivers & Support webpage for W7100 and select Linux x86_64 can see a link called Previous Drivers
and then you look for Linux x86_64 again and click on Releases Notes
and you'll see the APIs supported by this driver
OpenCL 2.0 is not supported on Ubuntu 18.04.0/1 by the drivers 18.Q3 and 18.Q4
All the best
Thanks, you saved me hours of work!
I did install the W7100 drivers but did not read the fine print. Will go back to the older drivers and guess that means OpenCL 2.0 will have to wait for a while.
if it's very urgent for you can enjoy OpenCl 2.0 through Windows 10 1803 with 18.Q4 driver .
Thanks, will stick to Linux :-)
If anyone from AMD reads this :
Why list a driver under Ubuntu 18.04 that does not work for kernel 4.15?
The script that comes with amdgpu-pro-18.20-606296 ends with a warning "WARNING: amdgpu dkms failed for running kernel", which was reported in may: