LG 1730SF on Ubuntu 10.04 Lucid Lynx

I went and installed a new machine to control the lobby touchscreen. On the previous installation a few years ago I had to heavily patch kernel modules to support this touchscreen. Now it works almost out of the box. X.Org X Server 1.7.6, kernel 2.6.32-23-generic and evtouch 0.8.8.

The touchscreen is identified as follows in /proc/bus/input/devices, ubuntu loads usbtouchscreen kernel module for it automatically.

  
I: Bus=0003 Vendor=0403 Product=f9e9 Version=0100
N: Name="ITM Inc USB Touch Panel"
P: Phys=usb-0000:00:1d.1-2/input0
S: Sysfs=/devices/pci0000:00/0000:00:1d.1/usb2/2-2/2-2:1.0/input/input5
U: Uniq=
H: Handlers=mouse1 event5 
B: EV=b
B: KEY=400 0 0 0 0 0 0 0 0 0 0
B: ABS=1000003

While browsing the net I found several different ways people have managed to get the touchscreen working on various versions of ubuntu, most of them are linked from rantakokko.net

Unfortunately none of those worked for Ubuntu 10.04. Seems like Ubuntu changes the way devices are set up for every release. It's still simple enough to get the touchscreen to work once you find out where the configuration is hidden on the current version and which configs are actually used. Xorg on 10.04 doesn't use HAL anymore, so adding itm touch correctly to policy files doesn't work. It doesn't have the regular /etc/X11/Xorg.conf either, also it doesn't support x11_options via udev. Ubuntu 10.04 Xorg uses udev and xorg.conf.d snippets. There is a problem with evtouch snippet though, it doesn't have MatchDevicePath option, so when Xorg detects evtouch device it tries to add it to all the handlers, it goes ok with the /dev/input/event*, but crashes on /dev/input/mouse*

(II) config/udev: Adding input device ITM Inc USB Touch Panel (/dev/input/mouse1)
.
.
(EE) ioctl EVIOCGNAME failed: Inappropriate ioctl for device
Unable to query/initialize EVTouch hardware.

Solution:

Install evtouch

apt-get install xserver-xorg-input-evtouch

Fix xorg.conf.d snippet at /usr/lib/X11/xorg.conf.d/10-evtouch.conf

Section "InputClass"
	Identifier "touchscreen catchall"
	MatchIsTouchscreen "on"
	MatchDevicePath "/dev/input/event*"
	Driver "evtouch"
	Option "MinX" "295"
	Option "MaxX" "3815"
	Option "MinY" "200"
	Option "MaxY" "3948"
	Option "Emulate3Buttons" "true"
	Option "Emulate3Timeout" "50"
	Option "SwapX" "1"
	Option "SendCoreEvents" "on"
	Option "Rotate" "ccw"
	Option "ReportingMode" "raw"
EndSection

In addition to the MatchDevicePath directive you can put all the usual evtouch configuration here as well. After these changes, Xorg.0.log should look like this.

(II) LoadModule: "evtouch"
(II) Loading /usr/lib/xorg/modules/input/evtouch_drv.so
(II) Module evtouch: vendor="Kenan Esau"
        compiled for 1.7.6, module version = 0.8.8
        Module class: X.Org XInput Driver
        ABI class: X.Org XInput driver, version 7.0
State: S_UNTOUCHED      Action: No Action               Button: 0
State: S_TOUCHED        Action: No Action               Button: 0
State: S_LONGTOUCHED    Action: down            Button: 1
State: S_MOVING Action: No Action               Button: 0
State: S_MAYBETAPPED    Action: click           Button: 1
State: S_ONEANDAHALFTAP Action: down            Button: 3
(**) Option "MinX" "295"
(**) Option "MaxX" "3815"
(**) Option "MinY" "200"
(**) Option "MaxY" "3948"
(**) Option "Emulate3Buttons" "true"
(**) Option "Emulate3Timeout" "50"
(**) Option "SwapX" "1"
(**) Option "SendCoreEvents" "on"
(**) EVTouch TouchScreen: always reports core events
(II) XINPUT: Adding extended input device "EVTouch TouchScreen" (type: TOUCHSCREEN)
(**) Option "Device" "/dev/input/event5"
(II) EVTouch TouchScreen: Found absolute axes
(II) config/udev: Adding input device ITM Inc USB Touch Panel (/dev/input/mouse1)
(II) No input driver/identifier specified (ignoring)

If you have touch panel rotated some other way, play with SwapX, SwapY and Rotate.