# Multitouch displays

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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 (PID) 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 from [1]. Currently vendor specific classes are available for 3M Cypress and eGalax. If none of this matches your device, you can try to experiment with the other MT_CLS_*. In this example

    #define MT_CLS_EGALAX                           0x0103

You need to convert MT_CLS_* to decimal (In this case, 0x0103 is 259 in decimal).

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 linux-input mailing list.

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

## Rotating the touch screen

Store and mark [2] executable (call the script to see its input options).

## Drivers

This article or section needs expansion.

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

### eGalax

The driver for eGalax touchscreens is available from the eGalax website. Also, it is availbale as xf86-input-egalaxAUR 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:

    /etc/eGtouchd.ini

    ...
    DetectRotation 0
    Direction 2
    Orientation 0
    ...

## Gestures

If you want gestures in your window manager, install toucheggAUR from the Arch User Repository and read its docs.

Category:

- Displays

Hidden category:

- Pages or sections flagged with Template:Expansion