And since without `pci=nocrs` touchpad and touchscreen are not working at all, 
attaching also second dmesg:
"""
$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.8.0-050800-generic 
root=UUID=415eed75-e8aa-4b5a-a49d-51f5b103641e ro quiet splash i8042.nopnp=1 
pci=nocrs "dyndbg=file drivers/pci/* +p" vt.handoff=7
"""


** Attachment added: "dmesg_i8042.nopnp=1+pci=nocrs+dyndbg.log.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1884232/+attachment/5392088/+files/dmesg_i8042.nopnp%3D1+pci%3Dnocrs+dyndbg.log.txt

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https://bugs.launchpad.net/bugs/1884232

Title:
  touchpad doesn't work at all on ACER Spin 5

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