multitouch with dual head/monitor Xorg

Having a multi-touch monitor (DELL P2314T) together with another non-multi-touch output confuses (in my case) the pointer maping – in other words, the pointer (mouse) is not where you touch the screen.

1) Make sure the touch screen is the leftmost monitor. Seems like offset-ing the pointer with xinput does not work (and something is buggy here), but scaling does. Actually that is not entirely true: offseting works with xinput, but in the case of multi-touch screen not being left-most the pointer is thrown to the rightmost pixel on X-axis the moment it’s supposed to appear on the multi-touch screen (this is true only for MT input, not for the actual mouse). If the touch-screen the leftmost, there’s no need to do offset, just proper scaling.

2) use xinput’s “Coordinate Transformation Matrix” to ‘remap’ it correctly:

$ xinput set-prop "Advanced Silicon S.A CoolTouch(TM) System" --type=float "Coordinate Transformation Matrix" 0.5 0 0 0 1 0  0 0 1

1	$ xinput set-prop "Advanced Silicon S.A CoolTouch(TM) System" --type=float "Coordinate Transformation Matrix" 0.5 0 0 0 1 0 0 0 1

see wiki.archlinux.org:Calibrating_Touchscreen

and here’s a simple /etc/X11/xorg.conf:

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "DELL P2314T"
    HorizSync       30.0 - 83.0
    VertRefresh     56.0 - 76.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Philips 226V4"
    HorizSync       30.0 - 83.0
    VertRefresh     56.0 - 76.0
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 960"
    BusID          "PCI:1:0:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 960"
    BusID          "PCI:1:0:0"
    Screen          1
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "DVI-I-1: 1920x1080_60 +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-5"
    Option         "metamodes" "HDMI-0: 1920x1080_60 +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "ServerLayout"

Identifier "Layout0"

Screen 0 "Screen0" 0 0

Screen 1 "Screen1" RightOf "Screen0"

InputDevice "Keyboard0" "CoreKeyboard"

InputDevice "Mouse0" "CorePointer"

Option "Xinerama" "0"

EndSection

Section "Files"

EndSection

Section "InputDevice"

# generated from default

Identifier "Mouse0"

Driver "mouse"

Option "Protocol" "auto"

Option "Device" "/dev/psaux"

Option "Emulate3Buttons" "no"

Option "ZAxisMapping" "4 5"

EndSection

Section "InputDevice"

# generated from default

Identifier "Keyboard0"

Driver "kbd"

EndSection

Section "Monitor"

Identifier "Monitor0"

VendorName "Unknown"

ModelName "DELL P2314T"

HorizSync 30.0 - 83.0

VertRefresh 56.0 - 76.0

Option "DPMS"

EndSection

Section "Monitor"

Identifier "Monitor1"

VendorName "Unknown"

ModelName "Philips 226V4"

HorizSync 30.0 - 83.0

VertRefresh 56.0 - 76.0

EndSection

Section "Device"

Identifier "Device0"

Driver "nvidia"

VendorName "NVIDIA Corporation"

BoardName "GeForce GTX 960"

BusID "PCI:1:0:0"

Screen 0

EndSection

Section "Device"

Identifier "Device1"

Driver "nvidia"

VendorName "NVIDIA Corporation"

BoardName "GeForce GTX 960"

BusID "PCI:1:0:0"

Screen 1

EndSection

Section "Screen"

Identifier "Screen1"

Device "Device1"

Monitor "Monitor1"

DefaultDepth 24

Option "Stereo" "0"

Option "metamodes" "DVI-I-1: 1920x1080_60 +0+0"

Option "SLI" "Off"

Option "MultiGPU" "Off"

Option "BaseMosaic" "off"

SubSection "Display"

Depth 24

EndSubSection

EndSection

Section "Screen"

Identifier "Screen0"

Device "Device0"

Monitor "Monitor0"

DefaultDepth 24

Option "Stereo" "0"

Option "nvidiaXineramaInfoOrder" "DFP-5"

Option "metamodes" "HDMI-0: 1920x1080_60 +0+0"

Option "SLI" "Off"

Option "MultiGPU" "Off"

Option "BaseMosaic" "off"

SubSection "Display"

Depth 24

EndSubSection

EndSection

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multitouch with dual head/monitor Xorg

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