Touchscreen usage

H.S.Rai hardeep.rai at gmail.com
Thu Mar 8 06:49:43 UTC 2012


On Thu, Mar 8, 2012 at 8:15 AM, H.S.Rai <hardeep.rai at gmail.com> wrote:
>
> Ububtu identify it as:
> IDEACO   IDC 6681
> and driver used is : EVDEV

After a lot of struggle, I could get it working, nearly OK for large icons.

Use command were:

xinput set-int-prop 10 "Evdev Axis Inversion" 8 1 1
xinput set-int-prop 10 "Evdev Axis Calibration" 32 1000 7000 1800 6500

Try tried to extract relationship among calibration parameters, finger
position, and cursor position, but could not.

At present xinput_calibrator through following output (complete output
is below signature):

new calibration data: -993, 65311, -2026, 65043

If I use this, touch screen don't work. I could not see any
relationship between worked parameters and result xinput_calibrator.

But I need to know this to fine tune calibration.

Can anyone tell me significance of these parameters. I tried to test
my math skill and tried relationship like

CursorX = A + B x FingerX
CursorY = C + D x FingerY

Assuming A, B, C and D will be calibration parameters. But I could not
arrive at any result.

If this not the right place to discuss this, I may be guided to some
other mailing list / forum, where I can get answer to this.

With regards,

-- 
H.S.Rai


Warning: multiple calibratable devices found, calibrating last one
(IDEACO  IDC 6681)
	use --device to select another one.
Calibrating EVDEV driver for "IDEACO  IDC 6681" id=11
	current calibration values (from XInput): min_x=0, max_x=65535 and
min_y=0, max_y=65535

Doing dynamic recalibration:
	Setting new calibration data: -993, 65311, -2026, 65043


--> Making the calibration permanent <--
  copy the snippet below into '/etc/X11/xorg.conf.d/99-calibration.conf'
Section "InputClass"
	Identifier	"calibration"
	MatchProduct	"IDEACO  IDC 6681"
	Option	"Calibration"	"-993 65311 -2026 65043"




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