xorg configuration for use with FBTFT on Raspian: /etc/X11/xorg.conf.d/fbtft.conf

fbtft.conf

# FBTFT xorg config file
#
# startx -- -layout TFT
# startx -- -layout HDMI
#
# startx
# When -layout is not set, the first is used: TFT
#

Section "ServerLayout"
    Identifier "TFT"
    Screen 0 "ScreenTFT"
EndSection

Section "ServerLayout"
    Identifier "HDMI"
    Screen 0 "ScreenHDMI"
EndSection

Section "Screen"
    Identifier "ScreenHDMI"
    Monitor "MonitorHDMI"
    Device "DeviceHDMI"
Endsection

Section "Screen"
    Identifier "ScreenTFT"
    Monitor "MonitorTFT"
    Device "DeviceTFT"
Endsection

Section "Monitor"
    Identifier "MonitorHDMI"
Endsection

Section "Monitor"
    Identifier "MonitorTFT"
Endsection

Section "Device"
    Identifier "DeviceHDMI"
    Driver "fbturbo"
    Option "fbdev" "/dev/fb0"
    Option "SwapbuffersWait" "true"
EndSection

Section "Device"
    Identifier "DeviceTFT"
    Option "fbdev" "/dev/fb1"
EndSection