Uinput doesn't work with Xorg

I try to use uinput to make simple autoclicker. It worked just fine in linux mint 18.3, but something is wrong on Ubuntu 18.04.

This is what xinput list show:

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                    id=4    [slave  pointer  (2)]
⎜   ↳ Logitech USB Optical Mouse                    id=10   [slave  pointer  (2)]
⎜   ↳ SIGMACHIP USB Keyboard                        id=12   [slave  pointer  (2)]
⎜   ↳ uinput_autoclicker                            id=14   [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard                   id=5    [slave  keyboard (3)]
    ↳ Power Button                                  id=6    [slave  keyboard (3)]
    ↳ Power Button                                  id=7    [slave  keyboard (3)]
    ↳ Sleep Button                                  id=8    [slave  keyboard (3)]
    ↳ USB2.0 Camera: USB2.0 Camera                  id=9    [slave  keyboard (3)]
    ↳ SIGMACHIP USB Keyboard                        id=11   [slave  keyboard (3)]
    ↳ SIGMACHIP USB Keyboard                        id=13   [slave  keyboard (3)]

And evtest output:

Event: time 1528384945.343765, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1528384945.343765, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
Event: time 1528384945.343765, -------------- SYN_REPORT ------------
Event: time 1528384945.368880, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1528384945.368880, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
Event: time 1528384945.368880, -------------- SYN_REPORT ------------
Event: time 1528384945.394015, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1528384945.394015, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
Event: time 1528384945.394015, -------------- SYN_REPORT ------------
Event: time 1528384945.419128, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1528384945.419128, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
Event: time 1528384945.419128, -------------- SYN_REPORT ------------
Event: time 1528384945.444304, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1528384945.444304, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
Event: time 1528384945.444304, -------------- SYN_REPORT ------------

and so on…

grep -e "Using input driver " /var/log/Xorg.0.log:

[  3012.644] (II) Using input driver 'libinput' for 'uinput_autoclicker'

Same problem if I try emulating keyboard/etc. How can I fix it?

UPD: I use cinnamon installed on XUbuntu. xorg.conf is auto-generated by nvidia-settings.