Touchscreen usage

[H.S.Rai]

I am using Ubuntu 11:10

I tried to use TouchScreen. It is reversed, i.e. if I touch top left
corner, it take it as bottom right. I referred:

http://ubuntuforums.org/showthread.php?t=1755896

Added option like following (not clear from above link where to add):

Option  "InvertX" "true"

But found no effect.

Used xinput_calibrator, output shown below signature, but problem
remain as such. It says:

copy the snippet into '/etc/X11/xorg.conf.d/99-calibration.conf'

But there is no file there named 99-calibration.conf

Can I get tip for easy setup / calibration of touch screen?

One more issue I observed. When I startr PC, screen display is fine,
but when I issue:

service lightdm restart

screen get shifted to right, some portion not visible and some part blank.

-- 
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: 56793, 7941, 53296, 15012


--> 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"	"56793 7941 53296 15012"
EndSection