Question: vnc how to change resolution?
Answer: Enable vncserver manually, to generate a default configuration file. Please skip this step if you have done it before. ... 
Kill the vncserver. Use the command “vncserver -kill” to kill the VNC server session we just started in the step 1. ... 
Edit ~/. ... 
Start the VNC server again with a screen resolution. ... 
Connect to the VNC server.