Csdrhrt

I need help with an issue we're facing in a project where we are moving from a Windows-based POS environment to one running on CentOS7.
The problem consists of a number of factors, please find the details below:

• The supplier of our POS application will only deliver an application that is hard-coded to run in a 1024:768 4:3 format.


• The hardware we are using is a POS unit from HP that has a built-in 16:9 touch-screen.


• The employees using this solution is not supposed to see nor have access to anything but the POS application.


• Our sales organization demands that touch is an available feature when going live with the new POS environment.

Going further into this, allow me to explain what we have encountered on the way trying to achieve the goal of having a touch-screen:

• We've simply changed the resolution in CentOS7 from 1920x1080 16:9 to 1024:768, we get the expected result with black boarders on the short edges of the touch-screen.


• We then started the POS application and quickly notice that the touch-screen doesn't work as expected, it hits other menus and buttons compared to where we actually touched the screen.


• We found similar posts regarding this issue but none where it is desired to achieve what we're trying to; running a 16:9 touch-screen with a 4:3 resolution.


• In similar posts we've found tools (xinput, xinput_calibrator, xrandr) that we tried using to resolve this but so far we haven't been able to and now we're not sure how to really approach this issue.

For instance, when we run xinput_calibrator we can see the application starting but it stretches beyond our screen resolution and we're unable to complete the calibration due to this.
Our beliefs are that; when we change the monitor resolution, the touch-screen doesn't consider this change and also has its "fixed size"... but all in all we're just guessing.

When running xinput we can see the touch-screen being listed as two different devices, but all in all they seem to have the same property values:

u239c   u21b3 ILITEK ILITEK-TP                            id=14   [slave  pointer  (2)]



u239c   u21b3 ILITEK ILITEK-TP                            id=15   [slave  pointer  (2)]

Looking closer on one of the devices (xinput list-props 14) we can see the following information and this is an example where it gets more difficult for us.. we're simply not sure what properties, in any, we need to focus on:

Device 'ILITEK ILITEK-TP':



Device Enabled (137):   1



Coordinate Transformation Matrix (139): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000



Device Accel Profile (265): 0



Device Accel Constant Deceleration (266):   1.000000



Device Accel Adaptive Deceleration (267):   1.000000



Device Accel Velocity Scaling (268):    10.000000



Device Product ID (259):    8746, 323



Device Node (260):  "/dev/input/event5"



Evdev Axis Inversion (269): 0, 0



Evdev Axis Calibration (270):   0, 16384, 0, 9600



Evdev Axes Swap (271):  0



Axis Labels (272):  "Abs MT Position X" (296), "Abs MT Position Y" (297), "None" (0), "None" (0)



Button Labels (273):    "Button Unknown" (262), "Button Unknown" (262), "Button Unknown" (262), "Button Wheel Up" (143), "Button Wheel Down" (144)



Evdev Scrolling Distance (274): 0, 0, 0



Evdev Middle Button Emulation (275):    0



Evdev Middle Button Timeout (276):  50



Evdev Middle Button Button (277):   2



Evdev Third Button Emulation (278): 0



Evdev Third Button Emulation Timeout (279): 1000



Evdev Third Button Emulation Button (280):  3



Evdev Third Button Emulation Threshold (281):   20



Evdev Wheel Emulation (282):    0



Evdev Wheel Emulation Axes (283):   0, 0, 4, 5



Evdev Wheel Emulation Inertia (284):    10



Evdev Wheel Emulation Timeout (285):    200



Evdev Wheel Emulation Button (286): 4



Evdev Drag Lock Buttons (287):  0

When running xrandr we can see that the resolution settings are what we expect, but we're not sure how to "tell" the touch-screen what the monitor resolution/format actually is.

Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192

eDP-1 connected primary 1024x768+0+0 (normal left inverted right x axis y axis) 309mm x 174mm

   1920x1080     60.05 +  40.03  

   1400x1050     59.98  

   1280x1024     60.02  

   1280x960      60.00  

   1024x768      60.04*   60.00  

   960x720       60.00  

   928x696       60.05  

   896x672       60.01  

   800x600       60.00    60.32    56.25  

   700x525       59.98  

   640x512       60.02  

   640x480       60.00    59.94  

   512x384       60.00  

   400x300       60.32    56.34  

   320x240       60.05  

DP-1 disconnected (normal left inverted right x axis y axis)

I'm sorry if the information provided is hard to understand, we're not all familiar with Linux but can perform the most basic tasks.
If we've missed any necessary information in this post please excuse us and do let us know what we should add to it in order for us to go further.

Many thanks in advance.

Best Regards
Danny