Unbuntu 18.04 and AMD driver -- need help

It seems that a lot of GPU problems revolve around specific versions of drivers. Though AMD has their own support structure, you can often learn from information reported by others who fold.

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Re: Unbuntu 18.04 and AMD driver -- need help

Postby Joe_H » Sun Jul 19, 2020 9:16 pm

Thanks for reporting back. I mentioned the "rabbit hole" I started down once, looks like you may have run into that bit I mentioned about the last Linux driver with OpenCL support giving incorrect results for calculations. You got a bit further than I did.
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Re: Unbuntu 18.04 and AMD driver -- need help

Postby MeeLee » Mon Jul 20, 2020 9:04 pm

do the opencl-dev packages help?
They seem to be somewhat universal?
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Re: Unbuntu 18.04 and AMD driver -- need help

Postby gunnarre » Mon Jul 20, 2020 10:22 pm

No, they don't help either of the issues that's been covered in this thread. This is about AMD's drivers and its OpenCL support.
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Re: Unbuntu 18.04 and AMD driver -- need help

Postby gunnarre » Tue Jul 28, 2020 3:37 pm

I made a virtual machine instance for the Radeon 7770 HD based on Ubuntu 14.04 and the Catalyst 15.7 drivers from AMD. I downgraded the kernel to 3.19.0-25, installed the fglrx_core .deb-file and its dependencies. I had to copy the file /etc/ati/amdpcsdb.default from fglrx_ (non-core) .deb file - otherwise clinfo would only work once and then segfault. I also installed fglrx-dev and ocl-icd-opencl-dev, but I'm not sure of that was necessary. The CPU usage seems to be similar as under Windows 10, depending on the work unit. Guest machine memory usage is less than half, down from over 2GB to between 380 and 760 MB when folding.
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