[Bug 901630] [NEW] multitouch + qt doesn't work (eg fingerpaint demo)

Erno Kuusela erno at iki.fi
Thu Dec 8 11:19:50 UTC 2011

Public bug reported:

I found a thread at https://lists.launchpad.net/multi-touch-dev/msg00798.html saying multitouch now  works in Ubuntu's Qt
and mentioned the Qt touch demos. Two finger pinch-zoom using the touchscreen works in Firefox on this hardware (HP EliteNook 2760p) out of the box- but none of the Qt multitouch Qt demos (eg fingerpaint, pinchzoom) from qt4-demos package work.

I tried to follow https://wiki.ubuntu.com/Multitouch/Testing but got
stuck at https://wiki.ubuntu.com/Multitouch/Testing/CheckingMTDevice -

the only plausible sounding device out of these..

$ sudo lsinput|grep name
   name    : "Sleep Button"
   name    : "Lid Switch"
   name    : "Power Button"
   name    : "AT Translated Set 2 keyboard"
   name    : "HP HD Webcam [Fixed]"
   name    : "HP WMI hotkeys"
   name    : "PS/2 Generic Mouse"
   name    : "SynPS/2 Synaptics TouchPad"
   name    : "ST LIS3LV02DL Accelerometer"
   name    : "Video Bus"
   name    : "HDA Intel PCH HDMI/DP,pcm=3"
   name    : "HDA Intel PCH Line In at Sep Rea"
   name    : "HDA Intel PCH Mic at Ext Right J"
   name    : "HDA Intel PCH Line Out at Sep Re"
   name    : "HDA Intel PCH HP Out at Ext Righ"

was the synaptics touchpad at /dev/input/event7 but:

$ mtdev-test /dev/input/event7
error: could not open device
$ sudo mtdev-test /dev/input/event7
error: could not grab the device

Also, xinput_calibrator shows the touchscreen as this, which didn't show up in lsinput:
$ xinput_calibrator --list
Device "Serial Wacom Tablet stylus" id=13
Device "Serial Wacom Tablet eraser" id=15
Device "Serial Wacom Tablet touch" id=16

https://wiki.ubuntu.com/Multitouch/HardwareSupport says that Wacom
should work.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: libqt4-core (not installed)
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Thu Dec  8 12:53:16 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
 PATH=(custom, no user)
SourcePackage: qt4-x11
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: qt4-x11 (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug oneiric running-unity

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  multitouch + qt doesn't work (eg fingerpaint demo)

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