Due to the huge possible combinations of drivers, video cards and operating systems, it is possible that hardware acceleration doesn't work with NoMachine. In this case it's suggested to disable it.
The use of hardware acceleration is managed through the NoMachine User Interface, in the Server preferences GUI on the server host:
- click on the !M icon in the system tray to open the context menu
- click on 'Show the service status' (or 'Show the server status' for earlier versions)
- click on 'Server preferences'
- click on 'Performance'
- check or uncheck the box ''Use acceleration for display processing"
Ticking the box will enable use of hardware acceleration for frame processing on the server.
Not ticking the box will disable use of hardware acceleration for frame processing on the server.