Black screen on NoMachine server

[jtbr]

Hello, I’m running a Linux Mint 21.2 64-bit Cinnamon server with NoMachine 8.10.1. It has an i5-2600k CPU with integrated GPU, as well as an Nvidia GeForce RTX 2060, with driver version 535.129.03.

When a client (and I’ve tried current versions of the iPad and Linux client, no difference) connects to the physical desktop, the screens turn black and then slowly begin fading between gray and black, punctuated by a split-second flash of the actual desktop. Some of the keys don’t work. It’s quite disconcerting and my first thought was that I’d been hacked. I had a video but it’s too big to upload.

I’ve seen similar issues here and tried the following workarounds on the server side, all without success:

– Set various hard-coded encoders

– Disable Hardware encoding

– Disable acceleration for display processing

– Disable “allow Flipping” in the NVidia settings.

– Use all the Nvidia Prime settings: Nvidia on-demand (my preferred setting), Intel (power saving) and NVidia (performance)

Any help is appreciated. Thanks

[Britgirl]

Hi, this

connects to the physical desktop, the screens turn black and then slowly begin fading between gray and black,

is because you activated screen-blanking and have the screen shading effect enabled. If you don’t want the fading affect, you can disable this. Go to server settings on the machine you are connecting to -> Server -> Security -> tick the second checkbox “Disable the screen shading effect….”.

punctuated by a split-second flash of the actual desktop. Some of the keys don’t work.

This is not normal, and we are trying to reproduce.

[jtbr]

Thank you, deactivating screen blanking from Security settings avoids this issue. I was not aware of that setting.

[Author]

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