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I've noticed my hash rates recently dropped (AMD rx 580s usually at 27-28MH/s each, now down to 19MH/s each) for unknown reasons, but when I run benchmark mode the rates are back to what I was used to seeing. Is there something benchmark mode is doing that doesn't limit the cards, or is this simply just real world vs benchmark?

Do you updated you gpu drivers? Because in the lastest version you need to enable the compute config in Global Settings > GPU Workload of AMD Radeon Settings.

If you are using Blockchain drivers Aug 23, this step it's not necessary, so you have another issue.

http://karlcode.owtelse.com/blog/2017/03/13/reverting-to-a-previous-kernel/
I had followed directions from here.

I'm dumb forgot to set a few things in the command line Embarrassed

hello.i m having this same issue as yours..may i know what to change to bring it back to normal..thnks..

I have the same problem. After I restart, three mining rigs drop hashrate from ~30 to ~20. Looking forward to your reply !!! Thanks.

I've been running into this as well. I've even reinstalled amd-gpu-pro blockchain and am getting the same results.

Benchmark runs gave me ~30 as normal so should not be any problems related to my local PCs. I did not do any updates, just restarting my rigs and this happens. I think this is somethings related to Claymore setups or mining server ... I am using Claymore 10.2 mining ETH and PASC with Ubuntu + Nanopool.

Some further reading I have been doing shows that it may have to do with the latest security patch to Ubuntu.
*update* I can confirm that booting up into a previous Kernel does seem to revert back to proper MH/s

Would you please tell me how to do it? I google and follow this instruction but it did not work. Thanks.
https://askubuntu.com/questions/82140/how-can-i-boot-with-an-older-kernel-version

http://karlcode.owtelse.com/blog/2017/03/13/reverting-to-a-previous-kernel/
I had followed directions from here.

Work perfect for me. So, the problem is I accidently updated to 4.13 and after be back to 4.10, everything is back to normal. This is another helful instruction https://askubuntu.com/questions/764241/how-to-remove-new-kernel-and-make-older-default-16-04
Thanks,