Huge Difference in Eth hashrate between W10 and Ubuntu

[Razoral]

Hello, I'm having trouble with my hashrate using claymore's miner. Im using Ubuntu for my mining rig, but W10 to modify BIOS and testing. The problem is that when I put my GPU in my mining rig, I hash at 23.735 MHs/s, while on windows I'm hashing at 29.8MHs/s. This difference is huge! Do you have any solutions or suggestion what might be the problem?

My mining rig is as follows:
Motherboard: AsRock H110i pro BTC+
CPU: Intel Celeron G3900
RAM: Kingston DDR4 2133Mhz 4GB
PSU: Corsair HX 1200
GPU: MSI RX580 4GB Armor

GPU BIOS:
Changed timings. 1:1500 timing value copied to 1:1500 to 1:2000 and 2:1500 timing value  copied to 2:1500 to 2:2000
The rest of the modification can be seen in the figure attached.

https://imgur.com/LYsTpAf

[Vann]

You probably need to update to the AMDGPU Pro compute mining drivers.

https://support.amd.com/en-us/kb-articles/Pages/AMDGPU-Pro-Beta-Mining-Driver-for-Linux-Release-Notes.aspx

Try mining a coin with a small Dag size like UBQ to see if it's the Dag file size issue that's solved by the mining drivers.