Question (mining) ETH Hashrate goes down, when screen goes off? New Win10 feature? New driver feature?

[VirtualLarry]

This is really frustrating. I updated my drivers last month on my main rig, and when I lock my workstation, and walk away, when I check my hashrate, it's only around 38MH/sec, instead of the proper 49-50MH/sec for my reference RX 5700.

I've double-checked my Wattman settings. I haven't tried rebooting or restarting my browser yet though.

I've seen this reported with newer Windows updates by people with Ampere GPUs, too.

So is this some new Windows' thing, relating to GPU power-management and GPU load?

 

[Shmee]

What drivers are you using now, and what miner? I know that newer than 21.5.1 is not supported by latest PM 5.6d. If you use newer ones, it will use generic openCL kernels, which can affect performance.

 

[VirtualLarry]

I am on 21.5.2 on this rig.

Using Nicehash, and NBMiner.

The thing is, it's not just a loss of hashrate from using an OpenCL kernel rather than an AMD-specific one (I have an AMD RX 5700), but the fact that it goes back up to 50MH/sec after a couple of "banner cycles" on the miner, once I sit down at the PC and get to my desktop screen.

 

[VirtualLarry]

I just upgraded my video drivers to 21.6.2, that should really screw things up.

Anyways, NBMiner is currently running, 51MH/sec.

Will check remotely via NH what hashrate is when I "Lock Workstation".

Edit: New drivers seem to have done the trick That or the PC just needed to reboot. Really weird.