Public bug reported:

The touchpad on the new ASUS GU501GM (the junior Zephyrus M that is a
Best Buy exclusive) does not seem to be detected whatsoever.  Below is a
printout of "xinput list".  I've also attached output files for devices,
dmesg, lspci -vnvn, Xorg.0.log, and version.log.  I suspect it is an
Elantech.  I did manage to get one command to print ELAN120x (x being
some number).  Alas, I don't remember the command now, and none of what
I've attached is showing it.  (Sorry, I've had a long night of
troubleshooting.)  The Windows 10 device manager won't even list the
brand, even though it's working there.  Still, I am fairly confident
it's Elan, as that's what ASUS seems to roll with these days.

I've tried various combinations of i8042.* kernel parameters, but to no
avail.  I've also tried blacklisting i2c_hid.  It's like it thinks the
touchpad is a keyboard?  I'm on Ubuntu 18.04.  I've tried the mainstream
kernel 4.16.7, also to no avail.  The latest release candidate (#4) for
4.17 would not let me log in past SDDM, and I noticed no touchpad
miracle while I was in the SDDM login screen.

If you have any further suggestions of what I could try, I would very
much appreciate it!  Thanks in advance!

xinput list:

⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ ASUSTeK Computer Inc. N-KEY Device        id=14   [slave  pointer  (2)]
⎜   ↳ Logitech USB Optical Mouse                id=15   [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)]
    ↳ Asus Wireless Radio Control               id=7    [slave  keyboard (3)]
    ↳ Video Bus                                 id=8    [slave  keyboard (3)]
    ↳ Video Bus                                 id=9    [slave  keyboard (3)]
    ↳ Power Button                              id=10   [slave  keyboard (3)]
    ↳ Sleep Button                              id=11   [slave  keyboard (3)]
    ↳ ASUSTeK Computer Inc. N-KEY Device        id=12   [slave  keyboard (3)]
    ↳ ASUSTeK Computer Inc. N-KEY Device        id=13   [slave  keyboard (3)]
    ↳ USB2.0 HD UVC WebCam: USB2.0 HD           id=16   [slave  keyboard (3)]
    ↳ Asus WMI hotkeys                          id=17   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=18   [slave  keyboard (3)]
    ↳ ASUSTeK Computer Inc. N-KEY Device        id=19   [slave  keyboard (3)]

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "devices, dmesg, lspci -vnvn, Xorg.0.log, and version.log 
information"
   https://bugs.launchpad.net/bugs/1770862/+attachment/5138419/+files/info.zip

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https://bugs.launchpad.net/bugs/1770862

Title:
  ASUS GU501GM touchpad not detected

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