Comment 41 for bug 1795292

Look at what this guy did:
https://forums.lenovo.com/t5/Lenovo-IdeaPad-1xx-3xx-5xx-7xx/Lenovo-Ideapad-330-15ARR-ryzen-5-bios-doesn-t-support-linux/m-p/4251437/highlight/true#M61640

to fix touchpad(not that easy if you havent compiled a kernel yet,not that difficult either)
1)download any kernel source from kernel.org(better choose the version that you are running presently or just the next updated version of it)
      *use the command 'uname -a' to find the current kernel version

2)extract the kernel source and find the file 17.4.xx/drivers/input/mouse/elan_i2c_core.c

3)locate the line { "ELAN061C", 0 } edit that '61C' to '61E' and save that file
4)compile and use your new kernel
(this link may help if you are a newbie in kernel compiling.I simply followed it-https://medium.freecodecamp.org/building-and-installing-the-latest-linux-kernel-from-source-6d8df534...)