16" eGalax USB Touchscreen

USB ID: 0eef:0001

Using evdev, touchscreen comes up and more or less. Calibration does not work. Moreover, when a drag event happens, the cursor is not moved relative to the position. It appears that the code is entering the relative-positioning block and doing additional offsetting.

The device is identified as a TOUCHPAD rather than TOUCHSCREEN:

(II) config/hal: Adding input device eGalax Inc. USB TouchController
(II) LoadModule: "evdev"
(II) Loading /usr/lib/xorg/modules/input//evdev_drv.so
(II) Module evdev: vendor="X.Org Foundation"
        compiled for 1.6.1, module version = 2.2.99
        Module class: X.Org XInput Driver
        ABI class: X.Org XInput driver, version 4.0
(**) eGalax Inc. USB TouchController: always reports core events
(**) eGalax Inc. USB TouchController: Device: "/dev/input/event5"
(II) eGalax Inc. USB TouchController: Found 2 mouse buttons
(II) eGalax Inc. USB TouchController: found absolute axes
(II) eGalax Inc. USB TouchController: Found x and y absolute axes
(II) eGalax Inc. USB TouchController: Found absolute touchpad
(II) eGalax Inc. USB TouchController: Configuring as touchpad
(**) eGalax Inc. USB TouchController: YAxisMapping: buttons 4 and 5
(**) eGalax Inc. USB TouchController: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
(II) XINPUT: Adding extended input device "eGalax Inc. USB TouchController" (type: TOUCHPAD)
(**) eGalax Inc. USB TouchController: (accel) keeping acceleration scheme 1
(**) eGalax Inc. USB TouchController: (accel) filter chain progression: 2.00
(**) eGalax Inc. USB TouchController: (accel) filter stage 0: 20.00 ms
(**) eGalax Inc. USB TouchController: (accel) set acceleration profile 0

Commenting out the following lines in the event handler (~line 468):

  abs = 0;
  rel = 1;

Prevents the code from entering the relative motion code, making it drag linearly.

Additionally, the above leaves "abs" set, making the code enter the next block ("abs && pEvdev->tool"), where the calibration settings take effect.

The reason the touchscreen is detected as a touchpad appears to be that "num_buttons" is 2, as per the above X.org log output. Forcing it down the path of being set as a touchscreen does not affect the behaviour.