Acer Switch 5 SW52 touchpad not working on Ubuntu 18.04

[dennis279]

I installed Ubuntu on my 2-in-1-Notebook [Acer Switch 5] with dual boot and everything works fine, except the Touchpad..
On Windows 10 it works normal..
xinput:
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Chicony ACER Tablet Keyboard id=12 [slave pointer (2)]
⎜ ↳ ELAN5515:00 04F3:22F0 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)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Power Button id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ Sleep Button id=10 [slave keyboard (3)]
↳ Chicony ACER Tablet Keyboard id=11 [slave keyboard (3)]
↳ USB Camera: USB Camera id=13 [slave keyboard (3)]
↳ ELAN5515:00 04F3:22F0 Pen id=15 [slave keyboard (3)]
↳ Intel Virtual Button driver id=16 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=17 [slave keyboard (3)]
↳ Acer WMI hotkeys id=18 [slave keyboard (3)]
↳ Chicony ACER Tablet Keyboard id=19 [slave keyboard (3)]

glad if someone could help me ^^