UbuntuHelp:EloTouchScreen

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https://help.ubuntu.com/community/EloTouchScreen

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ELO Touch-screen Driver Configuration

Ubuntu includes an Xorg xserver input driver in the package xserver-xorg-input-elographics for Dapper, Feisty, Gutsy, Hardy, Intrepid and Jaunty (for x86 and x86_64). This will work with many of the ELO touch-screen drivers, both serial and USB. E271-2210 and E271-2200 devices are supported. E281-2310 and compatible devices are supported with some features unavailable.

Installation

sudo apt-get install xserver-xorg-input-elographics

Note: Version 1.1.0-3 has a bug that is triggered when axis minimum and maximum values are inverted. Until the package is updated a patched version (1.1.0-3ubuntu1) is available from my PPA.

Configuration

Edit `/etc/X11/xorg.conf` and add a new !InputDevice section similar to this one. This example comes from a screen test on a laptop that is configured so the external graphics device is on X screen 1 (note the screenNo option) rather than the default screen 0.

Section "InputDevice"
        Identifier "ELO Touchscreen"
        Driver     "elographics"
        Option     "Device"     "/dev/ttyUSB0"
        Option     "AlwaysCore"
        Option     "screenNo"    "1"
        Option     "MinX" "4100"
        Option     "MaxX" "0"
        Option     "MinY" "0"
        Option     "MaxY" "4100"
        Option     "UntouchDelay" "5"
        Option     "ReportDelay" "1"
EndSection

Note: edit the Device value (/dev/ttyUSB0) to match the input device name the touch-screen input has. In this case, the device is a serial touch-screen connected via a serial-to-USB converter. You may have to invert the minimum and maximum X- and Y-scale values if the input values from the touch-screen are inverted. Use `man elographics" to see all the options and defaults. Add the input device to the !ServerLayout section so it looks similar to this:

Section "ServerLayout"
    Identifier     "Default Layout"
    Screen      0  "Screen0" 0 768
    Screen      1  "Screen1" Above "Screen0"
    InputDevice    "Synaptics Touchpad"
    InputDevice    "ELO Touchscreen"
EndSection

Save the file and log-out to restart the X server.

Calibration

Manual calibration is required. It is a case of repeatedly changing the minimum and maximum X and Y axis values in xorg.conf, restarting and testing. An alternative is to build and then run touchcal from a non-X terminal to determine minimum and maximum values to use in xorg.conf.