Ubuntu 20.04 Dual Touch Screen auto Calibration

I'm trying to set up 2 Melfas LGDisplay Incell Touch screens to auto calibrate at startup on Ubuntu 20.04

I found this post online that had the exact problem:

So what he did first is to created a file @ /etc/udev/rules.d/80-n-trig.rules

Here is what I did:

###############################################################################################3 KERNEL=="event*", SUBSYSTEM=="input", SUBSYSTEMS=="input", ATTRS{name}=="Melfas LGDisplay Incell Touch", ATTRS{phys}=="usb-0000:00:14.0-1.2.1/input0", SYMLINK+="input/ntrig-left"

KERNEL=="event*", SUBSYSTEM=="input", SUBSYSTEMS=="input", ATTRS{name}=="Melfas LGDisplay Incell Touch", ATTRS{phys}=="usb-0000:00:14.0-2.2.1/input0", SYMLINK+="input/ntrig-right" ###############################################################################################

I am able to generate the ntrig-left and ntrig-right event files with no problem.

but now I am stuck on the xorg.conf file. First of all, there isn't a xorg.conf file @ /usr/share/X11/xorg.conf.d/xorg.conf

I tried to create one using @ sudo X :1 -configure

I moved this template under /usr/share/X11/xorg.conf.d and renamed it xorg.conf.

I updated the new xorg.conf file with the following content: ########################################################################################

Under section ServerLayout added lines

InputDevice "TouchLeft" "CorePointer"
InputDevice "TouchRight" "CorePointer"

Add new InputDevice sections that link to input events (n-trig left and right)

Section "InputDevice"

Identifier "TouchLeft"

Driver "xhci_hcd"

Option "Device" "/dev/input/ntrig-left"

EndSection

Section "InputDevice"

Identifier "TouchRight"

Driver "xhci_hcd"

Option "Device" "/dev/input/ntrig-right"

EndSection ########################################################################################

After I rebooted the system, this new xorg.config file screwed my display a bit, I'm seeing blue vertical lines. but I guess we can skip pass that. but when I tried xinput in the terminal, I don't see TouchLeft or TouchRight.

I tried executing this in the command line:

#########################################################

xinput set-prop TouchLeft --type=float "Coordinate Transformation Matrix" 0.5 0 0 0 1 0 0 0 1

xinput set-prop TouchRight --type=float "Coordinate Transformation Matrix" 0.5 0 0.5 0 1 0 0 0 1

#######################################################

The result is device not found.

Can someone please help me with this. If there is another approach, I'm happy to take your advise too. I just need to develop something that will automatically calibrate my 2 touchscreens when a user logs in.

Thank you so much!!!!!!

Sorted by: Reset to default

Know someone who can answer? Share a link to this question via email, Twitter, or Facebook.

Your Answer

Sign up or log in

Sign up using Google Sign up using Facebook Sign up using Email and Password Submit

Post as a guest

Post Your Answer Discard

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy