I am using Debian 9. I have a little PC with 2 in-built monitors that I intend to use as a point of sale. It has one monitor facing the customer (non-touch screen) and one facing the cashier (touch screen). Each monitor has a resolution of 1366 x 768. I have a POS application that runs as the only x client - no window manager and no desktop manager exist. This way the system consumes minimal resources. I.e I can run it like so from the terminal:
xinit my-pos-app $* -- :1
The application runs fine so long as I use the mouse. However the intention is to have this work with just the touch screen.
The problem is that the touch screen is not calibrated. I can see that when I touch it, a spot about 10 cm to the right of where I touch is actually being activated. So I tried using
xinput_calibrator - a program that brings up a gui showing points on the screen to touch and automatically calibrate the touchscreen. But with the setup as it currently is, it is impossible to complete this step. This is because only one monitor is a touch screen and the other monitor is not, but
xinput_calibrator is not aware of this and it puts half the picture on each monitor. The calibrations points on the non-touch-screen monitor obviously cannot be touched and so I cannot complete the
I notice when I move the mouse to the right of the first monitor that it appears at the left of the second monitor. So the system appears to have positioned both monitors side-by-side. I don't know a whole lot about this low-level monitor configuration stuff, but going by the output from
xrandr, the system seems to think it only has 1 display:
$ xrandr Screen 0: minimum 320 x 200, current 2732 x 768, maximum 8192 x 8192 eDP-1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm 1366x768 60.00*+ 40.00 1360x768 59.80 59.96 1024x768 60.04 60.00 960x720 60.00 928x696 60.05 896x672 60.01 960x600 60.00 960x540 59.99 800x600 60.00 60.32 56.25 840x525 60.01 59.88 800x512 60.17 700x525 59.98 640x512 60.02 720x450 59.89 640x480 60.00 59.94 680x384 59.80 59.96 576x432 60.06 512x384 60.00 400x300 60.32 56.34 320x240 60.05 VGA-1 disconnected (normal left inverted right x axis y axis) DP-1 connected 1366x768+1366+0 (normal left inverted right x axis y axis) 344mm x 194mm 1366x768 60.00*+ 40.00 HDMI-1 disconnected (normal left inverted right x axis y axis)
xinput shows that device id for the touch screen is
Please can someone tell me how to configure the touch-screen correctly. Do I need to split the screens in 2 using xrandr first? If so then how would I do that? I'm stuck.