xorg.conf for Intel i915

Section "Screen"
    Identifier     "Screen0"
    Device         "intelgpu0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    SubSection "Display"
        Depth          24
        Modes          "1980x1080_60.00"
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "intelgpu1"
    Monitor        "Monitor1"
    DefaultDepth   24
    Option         "TwinView" "0"
    SubSection "Display"
        Depth          24
        Modes          "1980x1080_60.00"
    EndSubSection
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    Option         "Enable" "true"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    Option         "Enable" "true"
EndSection

Section "Device"
    Identifier     "intelgpu0"
    Driver         "intel"
    Option         "XvMC" "true"
    Option         "UseEvents" "true"
    Option         "AccelMethod" "UXA"
    #Option "NoAccel" "True"
    BusID          "PCI:0:2:0"

    #Option "Shadow"     "True" #disable GPU acceleration
    #Option        "TearFree" "true"
    #Option        "AccelMethod" "sna"
    #Option "DPMS" "false"
EndSection

#not loaded by default
Section "Device"
    Identifier     "intelgpu1"
    Driver         "intel"
    Option         "XvMC" "true"
    Option         "UseEvents" "true"
    Option         "AccelMethod" "UXA"
    #Option "NoAccel" "True"
    BusID          "PCI:0:2:0"

    #Option "Shadow"     "True" #disable GPU acceleration
    #Option        "TearFree" "true"
    #Option        "AccelMethod" "sna"
    #Option "DPMS" "false"
EndSection

Section "Device"
    Identifier "nvidiagpu1"
    Driver "nvidia"
    BusID "PCI:0:1:0"
EndSection