OMEN by HP Laptop 16-c0xxx flickering 2nd display

[hardbreaker]

Hi I bought this notebook in the beginning of July 2022 with Win10 on it. This time I haven't my issues ...

I installed several things...

HW:

* 64GB (2x 32 GB DDR4)

* 2nd SSD M.2 8TB

* USB-C 5GBit/s Ethernet connector

SW:

* Win 11

* Updated all drivers

I connected via HDMI a 4k 65" Screen and get some flickering (screens go black 200ms .. 1sec.). To me it looks like a problem of the 2nd screen and as a reaction to that, Win11 tries to switch to single monitor mode and therefore the 1st screen goes black too. Then after flickering, everything goes to normal and both screens are functional.

The effect increases, if we have much bus-traffic on PCI (e.g if copying from SSD to network). Then I have about 10 times a minute such flickering!!!

Would be nice to get a clue what driver is responsible. Is it really the graphics driver (AMD!), or can it be that we have a SSD driver problem or such. Sometimes I thought it is the network, but I switched from cable to WLAN with no changes. So I expect the problems somewhere else.

After flickering windows tries (unfortunately unsuccessful) to regenerate the window contents. They went to black and stay until hovered by mouse.

Running a virtual machine like VM-Ware leads to checkerboards on the guest operating system screens andd freeze up.

So finally it looks like some driver went ill and runs trough the memory leaving a random-number trail.

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Update!!!!

Due to reviewing the problem to describe it here, I tried to connect my second monitor with the Display-Port connector (instead of the HDMI).
In fact I use now a "Mini-DP to DP" Adapter and connect to this mini cable a "DP to HDMI" Adapter (4k60Hz capable) and then the same monitor again via HDMI cable to this adapter.

What should I say: No more flickering ...

Wondering ... hdmi DRIVER ???

2nd Update:
Too early. Flickering occurs still, but much less ... bad luck!

3rd Update:

It definetly has to do with the second display! Working with a single display I didn't see any flickering !