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Yes! That’s it, Hooray!
Thank you for your patience in helping me solve this problem.
I’m very pleased with NoMachine’s robustness and responsiveness. I can now use my remote machine and actually forget that it’s not directly connected to my monitor.
Great product, great support. I will recommend it to all my colleagues!
My Windows machine is running at 2560×1440. I’ve included a screenshot.
I also have the x11vnc server running on the Ubuntu machine. When I connect to it with either the RealVNC Viewer or the UltraVNC Viewer from the Windows machine I do get 2560×1440 resolution. Only NoMachine gets the resolution wrong. I’ve included a screenshot with RealVNC using the correct resolution.
I can use the other vnc viewers but I have stability issues with the local connections. The cloud RealVNC connection is more stable but much slower because it sends everything over the internet.
NoMachine beats both in terms of reliability and responsiveness, I just can’t get it to use the correct resolution!
Ok, I disconnected one monitor from the Win 10 machine and connected it to the Ubuntu machine. Then rebooted both so both are running with a single monitor of the same resolution.
When I connect NoMachine it correctly determines the remote display is 2560×1440 but somehow believes the local machine only has a resolution of 2048×1152.
I took a screenshot of Windows client with the NoMachine Display Settings pane. You will notice scroll bars at the edges because of seemingly mismatched resolutions.
I also took a screenshot on the Ubuntu server. This is running correctly at full resolution.
For reference, I’ve taken a screenshot of the Ubuntu machine directly connected the the monitor. I just switch monitor inputs to do this.
As you can see it will run at 2560×1440.
Ok, I ran xrand -q. The output is in attached file xrandr.txt.
2018-08-27 (1).png is a screenshot of my dual monitor setup. You will notice the resolution is 5120×1440 because each monitor is 2560×1440. You can also see the KDE Display and Monitor shows the resolution to be 2048×1152. If I change this to 2560×1440 then I get scroll bars on the top and side of the screen.
Hope this is helpful!