Multitouch displays

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Revision as of 07:50, 23 January 2012 by Gjasso (talk | contribs) (Configuration (USB devices): added linux-input mailing list link)
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Notes: please use the first argument of the template to provide more detailed indications. (Discuss in Talk:Multitouch displays#)

Since Linux Kernel 3.2, multitouch devices are handled by the hid-multitouch module, see Kernel Modules.

Configuration (USB devices)

Find the vendor ID (VID) and product ID for your touchscreen using lsusb:

$ lsusb
Bus 004 Device 002: ID 0eef:725e D-WAV Scientific Co., Ltd 

Here, VID=0eef (eGalax) and PID=725e. Now, get the MT_CLASS_* definitions for the VID from [1]. In this example

#define MT_CLS_EGALAX                           0x0103

an convert it to decimal (0x0103 is 259 in decimal in this case).

After loading the hid-multitouch, see Kernel Modules, you need to pass the devices' options with

# echo BUS VID PID MT_CLASS_* > /sys/module/hid_multitouch/drivers/hid\:hid-multitouch/new_id

In this example, the touchscreen is an USB device, so BUS=3 and the previous command looks like this:

# echo 3 0eef 725e 259 > /sys/module/hid_multitouch/drivers/hid\:hid-multitouch/new_id

Reboot. If the touchscreen is detected you should submit your devices' details (relevant lsusb line) to the [url=]linux-input mailing list[/url].

If the touchscreen is not working properly, you may need to install a specific driver for your touchscreen, see #Drivers.


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Reason: please use the first argument of the template to provide a brief explanation. (Discuss in Talk:Multitouch displays#)


The driver for eGalax tocushcreens is available from the eGalax website. Also, it is availbale as xf86-input-egalax-linux3AUR from the Arch User Repository.

Invert Y-axis

If after installing the eGalax driver the Y-axis of the touchscreen is inverted, edit the file /etc/eGTouchd.ini an change the value of Direction from 0 to 2:

DetectRotation 0
Direction 2
Orientation 0