[Bug 1774242] [NEW] Wacom touchscreens should disable gestures

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Bin Li (binli):

[Impact]

>From the original bug:

"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."

[Test case]

Install the update, note that the touchscreen behaviour is better.

[Regression potential]

>From the upstream commit:

"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."

but at least I (tjaalton) haven't heard of any complaints since we've
disabled gestures in focal (Nov 21st), so the warning might be a bit too
pessimistic about the impact.


--

/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

** Affects: xf86-input-wacom (Ubuntu)
     Importance: Undecided
     Assignee: Timo Aaltonen (tjaalton)
         Status: Fix Released

** Affects: xf86-input-wacom (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Timo Aaltonen (tjaalton)
         Status: In Progress


** Tags: amd64 apport-bug bionic ubuntu
-- 
Wacom touchscreens should disable gestures
https://bugs.launchpad.net/bugs/1774242
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