Problems with Multitouch on Debian Wheezy



  • Hi all,

    I have a debian wheezy system with Qt 5.5 and an USB Multitouch screen.

    • mtdev-test works and shows the correct number of recognized fingers (up to 10)
    • export QT_XCB_DEBUG_XINPUT_DEVICES=1 displays the following:
    # some other devices....
    qt.qpa.input.devices: input device  3M 3M MicroTouch USB controller
    qt.qpa.input.devices:    has 5 buttons
    qt.qpa.input.devices:    has valuator "Abs X" recognized? true
    qt.qpa.input.devices:    has valuator "Abs Y" recognized? true
    qt.qpa.input.devices:    has valuator "Abs MT Position X" recognized? true
    qt.qpa.input.devices:    has valuator "Abs MT Position Y" recognized? true
    qt.qpa.input.devices:    has valuator "" recognized? false
    qt.qpa.input.devices:    has valuator "" recognized? false
    qt.qpa.input.devices:    it's a scrolling device
    

    Well, okay... a scrolling device!?

    • export QT_LOGGING_RULES=qt.qpa.input=true and touching on the screen displays:
    qt.qpa.input: XI2 mouse motion 939,690, time 3870757
    qt.qpa.input: XI2 mouse motion 976,671, time 3870778
    qt.qpa.input: XI2 mouse motion 1025,648, time 3870778
    qt.qpa.input: XI2 mouse motion 1084,613, time 3870781
    qt.qpa.input: XI2 mouse motion 1151,576, time 3870789
    qt.qpa.input: XI2 mouse motion 1220,551, time 3870797
    
    

    So... Does anybody has an idea how to tell Qt that this is a multitouch device?
    Setting QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS to the appropriate event didn't helped.

    Thank you very much in advance!!


  • Lifetime Qt Champion

    Hi,

    I think you should bring this question to the interest mailing list. You'll find there Qt's developers/maintainers (this forum is more user oriented)


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