[RFH] Lenovo Ideapad U455 touchpad not always works

Hi, list.

I have a problem with my touchpad. It works fine, but not at every boot.
More specifically, AUX port not always initialized properly:
-----------------------------------------
i8042: PNP: PS/2 Controller [PNP0303:KBC0,PNP0f13:PS2M] at 0x60,0x64 irq 1,12
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12   # <-- this line is not always appear in dmesg output
-----------------------------------------
Here are two dmesg outputs:
http://paste.pro/5141560  <-- this time touchpad worked fine
http://paste.pro/5141561  <-- and this time touchpad was not working

I saw in the git logs that many laptops require some workaround to make
their touchpad work. I've tried i8042.notimeout, i8042.nomux and
i8042.noloop, but this didn't solve the issue. I wonder is there any way
to detect which options should I use to make touchpad work, other than
rebooting system countless number of times?

Output of lshw: http://paste.pro/5141562


-- Igor