Get Display:0 in ubuntu with RTX6000

Hello, the local client(ubuntu, RTX6000) is trying to linkup with remote server(solaris) by X11. It works when ssh to remote and export DISPLAY=ABC:0.0. The application on server requires DISPLAY:0, while the local client default DISPLAY is 1, as using the RTX6000. Guess enable the integrate graphic card can get DISPLAY 0. Tried, but not very successful. Any suggestion, thanks.