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[Florian Mayer <1774242@xxxxxxxxxxxxxxxxxx>]

The same issue happens on the Lenovo Thinkpad X1 Yoga 2nd gen. I think the rule above was simply a bit too much. Can somebody confirm a device where exactly the rules with the capability MatchIsTouchscreen "true" are really needed? Those devices seem to have a buggy HID descriptor.
If not, Ubuntu, could you please remove (or at least comment) these annoying rules since they seem to break a lot (if not all) Lenovo Yoga convertible devices...

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https://bugs.launchpad.net/bugs/1774242

Title:
  Wacom touchscreens should use libinput, not wacom driver

Status in xf86-input-wacom package in Ubuntu:
  Confirmed

Bug description:
  /usr/share/X11/xorg.conf.d/70-wacom.conf as shipped, has this:

  Section "InputClass"
          Identifier "Wacom touchscreen class"
          MatchProduct "Wacom|WACOM|PTK-540WL|ISD-V4"
          MatchDevicePath "/dev/input/event*"
          MatchIsTouchscreen "true"
          Driver "wacom"
  EndSection

  The result is that on my Yoga 920, in a plain X11 session (running
  openbox in my case), the touchscreen acts like a broken mouse: there
  is no multi-touch capability in Qt Quick applications, and clicking
  isn't quite right either.  I also verified it with Peter Hutterer's
  old cairo-based mt-touch test program.

  I suspect we will get some users mistakenly writing up Qt bugs about
  this if you don't ship a fix.  (Seems to me that already happened at
  least once, actually.)

  Yes, the touchscreen is made by Wacom, but wacom_drv.so has
  historically been only for Wacom tablets and in-screen stylus
  digitizers, and IMO that continues to be the case.  libinput is a much
  better choice of driver for this hardware (so is evdev for that
  matter), so I changed it to Driver "libinput" and got it working.
  (Wayland uses libinput, so in a wayland session, touch already works
  fine in Qt apps on this hardware.)

  I'm one of the Qt Quick maintainers, most concerned with touch
  handling, and I've also written some of the Qt xcb code for dealing
  with XInput touch and tablet devices.  So if you think that there's
  something wrong with Qt, such that it should still work anyway to use
  a wacom driver for a Wacom touchscreen, let me know.  These AES
  devices are still new to me (that's why I got a Yoga, to try it out).

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xserver-xorg-input-wacom 1:0.36.1-0ubuntu1 [modified: usr/share/X11/xorg.conf.d/70-wacom.conf]
  ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
  Uname: Linux 4.15.0-22-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  Date: Wed May 30 19:40:51 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  MachineType: LENOVO 80Y7
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-22-generic root=ZFS=rpool/ROOT/ubuntu ro
  SourcePackage: xf86-input-wacom
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/22/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 5NCN38WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo YOGA 920-13IKB
  dmi.modalias: dmi:bvnLENOVO:bvr5NCN38WW:bd02/22/2018:svnLENOVO:pn80Y7:pvrLenovoYOGA920-13IKB:rvnLENOVO:rnLNVNB161216:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrLenovoYOGA920-13IKB:
  dmi.product.family: YOGA 920-13IKB
  dmi.product.name: 80Y7
  dmi.product.version: Lenovo YOGA 920-13IKB
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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