Black screen on reconnecting to server on Linux from Mac

[electrosaur]

Server: RHEL 8.8 / Gnome 3.32.2 / NoMachine 8.5.3  (free version) / Physical display

Client: macOS Ventura 13.4 / NoMachine 8.5.3 (free version)

I’m frequently getting a black screen when I reconnect. This has started happening after updating to NoMachine 8.5.3. Restarting the nxserver via systemctl restart nxserver doesn’t fix it. I’m having to restart gdm as well. Any workaround that doesn’t involve restarting gdm?

[Britgirl]

“Reconnect” suggests that you can connect the first time and use the session, you then disconnect and then try to reconnect but can’t, which seems strange.

Anyway, take a look at the third option in this https://kb.nomachine.com/AR03P00973. Use the proper command to stop the X server according to your display manager and then restart the server.

[electrosaur]

Yes, that’s correct: I can connect the first time and everything is fine. I should have said that it only happens sometimes on reconnecting. Most times I can reconnect just fine.

About the third option in the link. I am restarting gdm via sudo systemctl restart gdm, but I want to avoid that as it loses the desktop state. Don’t want to use Xvfb because it doesn’t support resizing the display.

Is there something I can look for in the logs to see why things get into the black screen state?

[Britgirl]

This is not the correct behaviour and we’d like to check further by asking you to submit debug logs.

Please follow the instructions here and then submit logs from the server to forum[at]nomachine[dot]com.

https://kb.nomachine.com/DT07S00244

In the meantime you can try the suggestion in the article (NoMachine will create its own virtual framebuffer) and you would then be able to resize.

Is this server running Wayland or Xorg? If it’s the first, try Xorg and tell us if you get the same behaviour.
More notes about desktops on Wayland are available here: https://kb.nomachine.com/AR02P00969

[electrosaur]

Server is running Xorg. It has happened again now. I am collecting the server side logs and will submit them.

[Britgirl]

We didn’t receive the logs. Please update to the latest version (both sides) and let us know if you can reproduce the same issue by opening a new topic and providing steps to reproduce, along with logs.

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