You make excellent points.

1) Going forward I believe the Gnome guys see anything that's not
libinput as unsupported. So we could log an enhancement request to get
them to add Xorg synaptics support (ie. tweak the same things as
'synclient' does). But they're likely to ignore that request. Still, I
think if someone could implement it based on the synclient code, they
might accept a patch.

2) This is certainly a problem and what we should be fixing (although I
haven't tested upgrades myself to verify). Let's make this bug about the
upgrade problem.

Thanks for persisting and figuring it out.

** Summary changed:

- touchpad disable while typing, disable tap-to-click don't work in 17.10
+ Touchpad settings don't work after upgrading to 17.10 
(xserver-xorg-input-synaptics is still installed)

** Summary changed:

- Touchpad settings don't work after upgrading to 17.10 
(xserver-xorg-input-synaptics is still installed)
+ Touchpad settings don't work after upgrading to 17.10 (because 
xserver-xorg-input-synaptics is still installed)

** Changed in: libinput (Ubuntu)
       Status: Incomplete => New

** Also affects: gnome-control-center (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: libinput

** Changed in: gnome-control-center (Ubuntu)
   Importance: Undecided => High

** Changed in: libinput (Ubuntu)
   Importance: Undecided => High

** Changed in: gnome-control-center (Ubuntu)
   Importance: High => Medium

** Changed in: libinput (Ubuntu)
   Importance: High => Medium

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1733032

Title:
  Touchpad settings don't work after upgrading to 17.10 (because
  xserver-xorg-input-synaptics is still installed)

Status in gnome-control-center package in Ubuntu:
  New
Status in libinput package in Ubuntu:
  New

Bug description:
  Since upgrading to 17.10, my mouse pointer is repeatedly and
  frequently getting moved against my will when I am typing on my laptop
  keyboard (as opposed to external keyboard) because my hand brushes
  against the touchpad or even just near its surface.

  Furthermore, I don't want tap-to-click to be enabled. I want to
  actually have to push down on the mousepad hard enough to click it to
  generate a mouse button event. I can't figure out how to disable tap-
  to-click in 17.10 either.

  I did not have these problems _at all_ in 17.04.

  I have the touchpad click method set to "Areas" and "Disable While
  Typing" enabled in gnome-tweak-tool. This does not help.

  I have these lines in the touchpad section of
  /usr/share/X11/xorg.conf.d/40-libinput.conf as well:

  Option "DisableWhileTyping" "true"
  Option "PalmDetection" "true"
  Option "Tapping" "false"

  They don't help either.

  This is a substantial regression in functionality from 17.04.

  It appears to be a problem using both Wayland and Xorg.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.26.1-0ubuntu5
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.4
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Nov 17 21:28:05 2017
  DisplayManager: gdm3
  InstallationDate: Installed on 2017-05-19 (182 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to artful on 2017-10-20 (28 days ago)

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