Is General Touch Co.,Ltd operational?

Question

linux

I am in the hands of Archlinux:

#> uname -a
Linux aa8aba8f-be8c-4f95-a7f4-2fde735694c2 4.14.12-1-ARCH #1 SMP PREEMPT Fri Jan 5 18:19:34 UTC 2018 x86_64 GNU/Linux

I have a touchscreen:

#> lsusb
...
ID 0dfc:0001 GeneralTouch Technology Co., Ltd Touchscreen
...

#> xinput list-props 9
Device 'General Touch Co.,Ltd GeneralTouch Touchscreen':
  Device Enabled (135):	1
  Coordinate Transformation Matrix (137):	31.000000, 0.000000, -0.019000, 0.000000, 39.000000, -0.480000, 0.000000, 0.000000, 1.000000
  libinput Calibration Matrix (272):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
  libinput Calibration Matrix Default (273):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
  libinput Send Events Modes Available (255):	1, 0
  libinput Send Events Mode Enabled (256):	0, 0
  libinput Send Events Mode Enabled Default (257):	0, 0
  Device Node (258):	"/dev/input/event3"
  Device Product ID (259):	3580, 1

#> grep -e "Using input driver 'libinput'" Xorg.0.log
...
[  1788.941] (II) Using input driver 'libinput' for 'General Touch Co.,Ltd GeneralTouch Touchscreen'
...

The problem is that the tap-to-touch event doesn't fire . In a full-screen OpenGL application, the cursor moves, but clicking on any area has no effect.
Tapes happen in libinput debug-events , that is, the device itself seems to work correctly.
I would be very grateful for any tips, because googling did not give anything.