About the AMD Linux drivers 19.50-967956:
These drivers fix the hardware control issues from the previous Linux drivers and support RX5500. However, they reintroduce the Navi TLB problem and the hashrates are about 10-14 MH/s, so you are better off with the previous Linux drivers for Navi cards (or use Windows).
They seem to forgot adding this in 19.50, here is how to fix the problem on Ubuntu or other debian:
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Enjoy mining with newest driver
Nice find! Thank you very much for this information!
We have put together the patched files from the driver and here are the slightly easier installation instructions for the patched driver:
1. If you have installed the unpatched driver or any other AMD driver, uninstall it first:
and then reboot the rig.
2. Download the driver from AMD web site (it will be named
amdgpu-pro-19.50-967956-ubuntu-18.04.tar.xz)
3. Download the patch from here:
https://github.com/PhoenixMinerDevTeam/files/blob/main/amdgpu-pro-19.50-967956-patch.tar.gz?raw=true (the file name is
amdgpu-pro-19.50-967956-patch.tar.gz)
4. To verify the downloaded patch file, you can use the following checksums:
SHA-1: 1f8ca89e98f9cb625ae9ad6194a012a642f4b39d
SHA-256: c969e326971acbaef9a3e20d0aa2459f70ac5b6cd5cbde79614289c99051a9aa
SHA-512: e96652ffac48375b97b756bed02296180ef92a07f9b407db66bf003c58d805e80f15e9c9a2525e2706b0de7e4391e732ae6800adf90c9730fb25546581a1a6a5
5. Place both files in the same folder and first extract the files of the driver with the following command:
tar -Jxvf amdgpu-pro-19.50-967956-ubuntu-18.04.tar.xz
6. Then extract the patched files, which will overwrite some files in the extracted driver:
tar -zxvf amdgpu-pro-19.50-967956-patch.tar.gz
7. Finally, go to the extracted driver folder and start the installation with the following commands:
cd amdgpu-pro-19.50-967956-ubuntu-18.04
./amdgpu-pro-install -y --opencl=pal,legacy --headless
Hi,
The average share difficulty for dev mining is 5 Mhs but regular share difficulty is 20 Ghs . Why such a huge difference ?
The share difficulty is determined by the pool. When the pool used for devfee is different than your pool, the difficulty can also be different.