xorg.conf

Section "ServerLayout"
    Identifier "X11 Server"
    Screen "Screen (xrdpdev)"
    InputDevice "xrdpMouse" "CorePointer"
    InputDevice "xrdpKeyboard" "CoreKeyboard"
EndSection

Section "ServerFlags"
    Option "DontVTSwitch" "on"
    Option "AutoAddDevices" "off"
EndSection

Section "Module"
    Disable "glx"
    Disable "dri"
    Load "xorgxrdp"
    Load "fb"
EndSection

Section "InputDevice"
    Identifier "xrdpKeyboard"
    Driver "xrdpkeyb"
EndSection

Section "InputDevice"
    Identifier "xrdpMouse"
    Driver "xrdpmouse"
EndSection

Section "Monitor"
    Identifier "Monitor"
    Option "DPMS"
    HorizSync 30-80
    VertRefresh 60-75
    ModeLine "1920x1080" 138.500 1920 1968 2000 2080 1080 1083 1088 1111 +hsync -vsync
    ModeLine "1280x720" 74.25 1280 1720 1760 1980 720 725 730 750 +HSync +VSync
    Modeline "1368x768" 72.25 1368 1416 1448 1528 768 771 781 790 +hsync -vsync
    Modeline "1600x900" 119.00 1600 1696 1864 2128 900 901 904 932 -hsync +vsync
EndSection

Section "Device"
    Identifier "Video Card (xrdpdev)"
    Driver "xrdpdev"
EndSection

Section "Screen"
    Identifier "Screen (xrdpdev)"
    Device "Video Card (xrdpdev)"
    Monitor "Monitor"
    DefaultDepth 24
    SubSection "Display"
        Depth 24
        Modes "640x480" "800x600" "1024x768" "1280x720" "1280x1024" "1600x900" "1920x1080"
    EndSubSection
EndSection