I have a question about setting the transformation matrix value to rotate touch coordinates on Ubuntu 18.04 and 20.04.
I used 2 portrait monitors. +-----------+ +-----------+ | 1080x1920 | | 1080x1920 | | (touch) | | | | | | | +-----------+ +-----------+ I used "TransformationMatrix" option in a configuration file. root@touch-desktop:/usr/share/X11/xorg.conf.d# more 77-touch-matrix.conf Section "InputClass" Identifier "Touch rotation" MatchUSBID "2965:*" MatchDevicePath "/dev/input/event*" Driver "evdev" for Ubuntu 16.04, "libinput" for Ubuntu 18.04/20.04 Option "TransformationMatrix" "0 -0.5 0.5 1 0 0 0 0 1" EndSection It works well on Ubuntu 16.04 and Ubuntu 20.04, but does not work on Ubuntu 18.04. As a workaround, I'm executing "xinput set-prop" as a startup script. touch@touchDT:~$ more .profile /home/touch/set-matrix.sh & touch@touchDT:~$ more set-matrix.sh #!/bin/bash sleep 30 /usr/bin/xinput set-prop 10 "Coordinate Transformation Matrix" 0 -0.5 0.5 1 0 0 0 0 1 I don't like it because 1) I'm using 30 seconds delay because the matrix is initialized during the startup phase and I want to confirm that my code is executed later. 2) The matrix value is sometimes changed while the system is turned on and under use. Would you help me please? -- Another related question is about eGalaxTouch. If I change my monitor to a monitor with eGalaxTouch device, the matrix value is automatically updated if I change the geometry of the monitors, only on Ubuntu 20.04. touch@touchDT:~/Desktop$ xinput list-props 13 Device 'eGalax Inc. eGalaxTouch P80H84 0765 v00T3_M02 k4.08.165': Device Enabled (161): 1 Coordinate Transformation Matrix (163): 0.000000, -0.500000, 1.000000, 1.000000, 0.000000, 0.000000, 0.000000, 0.000000, 1.000000 I did not install the driver of it and did not run the daemon program ( /bin/eGTouchD). I wonder how the matrix value is set correctly and touch works well even if I did not specify it on Ubuntu 20.04. For other touch monitors, I need to specify it manually in a configuration file. Would you let me know where to start my investigation please? -- Hugh Chang
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