eGalax touchscreen calibration

[Markamc]

Ok, so you cannot see the pointer when using the touchscreen, and it has no effect on the reported pointer value when touching the screen.

So at max x-pos., the equation gives: 1280 - (-0.666 * 1280) - 1280 = 852.48
and at min x-pos, , the equation gives: 1280 - (-0.666 * 0) - 1280 = 0

can you find the corresponding evtest values for top left and bot right, it might help