Black screen when connecting to Ubuntu 24.04.1 LTS

[linux-ninja]

Hi Team,

I am dealing with the same issue, I am also running “Ubuntu 24.04.1 LTS”

I am running the latest version of nomachine “8.14.2-1″…I am getting a black screen when I try to connect from a Ubuntu client 24.04.1 LTS to the server running Ubuntu 24.04.1 LTS. I tried various thing but still the black screen persists. Please advise.

Attachments:

1. 

   nomachine_blackscreen.png
   

[Britgirl]

Hi,

I spun off your issue because it appears to be a different one, and it’s better to keep this black screen issue separate from “player disconnects”.

I tried various thing but still the black screen persists

Did you try any/all of the tips explained here?

Connecting to Linux headless machines with NoMachine
https://kb.nomachine.com/AR03P00973

Have you tried disabling Wayland and using X.org?

If none of those worked, please confirm the desktop environment you are connecting to on the Ubuntu host (and that you have NoMachine 8.14 on both sides).

[Britgirl]

I saw your request for the patch in another topic, https://forum.nomachine.com/topic/after-upgrade-to-ubuntu-24-04-1-lts-players-immediately-disconnects/page/3#post-50869. What you can do is send us the logs for the issue that you are experiencing, submit them here or send to forum[at]nomachine[dot]com, so we can check first whether your issue is related to the problem in the other topic.

Enable debug on the server side, then reproduce the problem. You can extract them using the instructions here: https://kb.nomachine.com/DT07S00243

[linux-ninja]

@Britgirl,

I think this issue is impacting Ubuntu to Ubuntu connectivity using release 24.04.1 LTS. As previously mentioned RHEL to Ubuntu 24.04.1 LTS appears to be working fine.

[Britgirl]

Hi, please let us know if you are still experiencing the black screen issue when connecting from Ubuntu. Update to 8.16 on both client and server. If you are still able to reproduce the issue, disable HW decoding on the client side. To do that, please follow the instructions here: https://kb.nomachine.com/AR07U01202. In your case, you should be disabling by setting <option key=”Enable hardware accelerated decoding” value=”disabled” />

[linux-ninja]

Using 8.16.1.X in both client and server the issue persist, but it appearsw this issue is impacted Ubuntu to Ubuntu connections….I was able to connect to a RHEL 8 server from a Ubuntu 24.04.01 LTS client just fine. Please investigate this issue and increase criticality. Thank you.

[Britgirl]

And disabling HW decoding on the Ubuntu client side when connecting to the Ubuntu server changes nothing? Send us the logs as from both sides as per the instructions here, thanks: https://kb.nomachine.com/DT07S00243

[linux-ninja]

Hi Britgirl, I tried disabling the client side HW decoding, the same black screen appears. I am attaching another set of logs to see if those can help determine the root cause of the issue. Thank you for the support.

Attachments:

1. NoMachine-log-2025.02.12-04.48.44-1.zip

[linux-ninja]

I think I am making progress on the issue, I normally have 3 monitors connected to the machine but when I leave the office and connect from work I turn off my monitors so people in the office dont see my work. The big question is how to make nomachine work when the monitors are turn off, I have validated the black screen is happening because the monitors are off, now how do we tell nomachine to work even when the monitors are off. Thank you fr your input,

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