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Thread: erratic multitouch touchpad

  1. #1
    Join Date
    Feb 2007
    Location
    bergamo, italy
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    Ubuntu 10.10 Maverick Meerkat

    erratic multitouch touchpad

    hi,

    i've recently bought a samsung n150 plus netbook, installed ubuntu and found it perfect except for the multitouch on the trackpad.

    the bad behavior is as follows:

    put one finger on it then very little later put a second finger on it and the cursor of the mouse jumps all over the place. same goes when taking fingers off: if you have two fingers and release one only slightly before the other the cursor is really jumpy. this happened on 10.10 desktop and 10.10 netbook edition (as well as jolicloud...)

    i tried many different xinput configurations,(including setting the JumpyCursorThreshold property to a various level) with no results. i followed about half a dozen threads in the forums but none seemed to have a solution. i think there is a bug on launchpad for it that has a very low importance level.

    things that seem to me of importance:
    - when the two fingers are very very very precisely put together on the touchpad, the behavior is correct, but we're talking about a non usable precision.

    - testing the device through xinput shows that on an erratic double press the button 5 (that is, scrolling) looks like it's being pressed a gazillion times.

    - the xinput device uses a elantech touchpad

    -trying the unit with an opensuse 10.3 live usb the touchpad behaves correctly, xinput reports the device as a "Im/PS Logitech Wheel Mouse" not as a symantec or elantech touchpad.


    any help would be appreciated as this minor failure is very annoying on an otherwise perfect experience.

    thanks!

  2. #2
    Join Date
    Feb 2007
    Location
    bergamo, italy
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    Hidden!
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: erratic multitouch touchpad

    bumping this one.

    really nobody with a faulty elantech driver out there?

    btw, an usable workaround - ie reverting to an older generic driver that works - would be:

    Code:
    sudo modprobe -r psmouse
    sudo modprobe psmouse proto=imps
    or to set it permanently:

    Code:
    echo "options psmouse proto=imps" | sudo tee -a /etc/modprobe.d/options.conf
    this one loads the driver i found on opensuse wich works to a level: smooth 2 fingers vertical scroll, 1-2-3 fingers tap, no horizontal scroll, no pinch and rotate and mostly no touchpad suspend while writing.

    i also havent found the exact same bug on launchpad, although many similar.

    any comment welcome

  3. #3
    Join Date
    Apr 2010
    Location
    UK
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    15
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: erratic multitouch touchpad

    Thank you!

    I've just bought a N150 plus for a friend, and was beginning to despair about the erratic multitouch and lack of vertical scrolling, not too bothered about any of the other missing features, this fix has fixed all I needed! Thank you!!!


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