how to set priority to display output for two RTX 2080ti graphics cards?

Graphics / Linux Linux
1

Under Ubuntu 16.04 system, how to set priority to display output for two RTX 2080ti graphics cards?

2

Create/modify /etc/X11/xorg.conf like

Section "Device"
    Identifier     "nvidia"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BusID          "PCI:1:0:0"
    Option         "AllowEmptyInitialConfiguration"
EndSection

and set the BusID parameter to the PCI ID of the card (hint: xorg.conf wants decimal values, lspci displays hex)