Kubuntu 26.04 black screens when multiple display cards with monitors

[timok]

I have Kubuntu 26.04 with two NVIDIA RTX 2000 display cards. Each display card has 4 display cards. Kubuntu desktop shows all 8 monitors OK. I have installed latest 9.7.2 NoMachine into computer and to client. Client is Ubuntu 24.04.

When I connect to the computer, it shows all 8 screens as black. I switched hardcode acceleration off. Still black. I tried setting GPULoadBalancingAlgorithm to load-based and GPU0. Still black.

I removed the monitors on second RTX 2000: now 4 monitors show OK.

Should NoMachine work with this setup?

Any hints?

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