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[Bin Li <1774242@xxxxxxxxxxxxxxxxxx>]

I tried the upstream patch on xserver-xorg-input-wacom 1:0.36.1-0ubuntu1
on 18.04, this issue is fixed.

commit 31a5405f7d9405bc514585709161287b0c67386e
Author: Jason Gerecke <killertofu@xxxxxxxxx>
Date:   Mon Sep 9 15:32:17 2019 -0700

    Change default gesture mode: touchpad=on, touchscreen=off

    A large number of users run the GNOME desktop which has its own gesture
    engine that performs actions on touchscreens. These gestures are much
    better than the ones we provide, so lets disable our engine by default
    for touchscreens. Note that GNOME doesn't do anything with touchpad
    gestures, so we leave them enabled by default.

    Note that this change will effectively cause a feature regression for
    users of other environments that do *not* have their own gesture
    engines (Cinnamon, KDE, MATE, XFCE, etc.). Users will want to add an
    xorg.conf.d snippet with `Option "Gesture" "on"` to bring back the
    functionality.

    Signed-off-by: Jason Gerecke <jason.gerecke@xxxxxxxxx>


** Patch added: "change-default-gesture-mode.patch"
   https://bugs.launchpad.net/ubuntu/+source/xf86-input-wacom/+bug/1774242/+attachment/5335647/+files/change-default-gesture-mode.patch

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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:
  Fix Released
Status in xf86-input-wacom source package in Bionic:
  In Progress

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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