Ubuntu 11.04 touchpad scrolling doesn't work

I have a netbook acer aspire one d260...

Vertical scrolling was working with ubuntu 10.04 10.10 32 and 64 bit...with ubuntu 11.04 32 and 64 no more..

simone@Aspire:~$ synclient -l
Parameter settings:
    LeftEdge = 153
    RightEdge = 870
    TopEdge = 115
    BottomEdge = 652
    FingerLow = 12
    FingerHigh = 14
    FingerPress = 127
    MaxTapTime = 180
    MaxTapMove = 56
    MaxDoubleTapTime = 180
    SingleTapTimeout = 180
    ClickTime = 100
    FastTaps = 0
    EmulateMidButtonTime = 75
    EmulateTwoFingerMinZ = 40
    EmulateTwoFingerMinW = 0
    VertScrollDelta = 25
    HorizScrollDelta = 25
    VertEdgeScroll = 0
    HorizEdgeScroll = 0
    CornerCoasting = 0
    VertTwoFingerScroll = 0
    HorizTwoFingerScroll = 0
    MinSpeed = 1
    MaxSpeed = 1.75
    AccelFactor = 0.156495
    TrackstickSpeed = 40
    EdgeMotionMinZ = 14
    EdgeMotionMaxZ = 79
    EdgeMotionMinSpeed = 1
    EdgeMotionMaxSpeed = 102
    EdgeMotionUseAlways = 0
    TouchpadOff = 1
    LockedDrags = 0
    LockedDragTimeout = 5000
    RTCornerButton = 2
    RBCornerButton = 3
    LTCornerButton = 0
    LBCornerButton = 0
    TapButton1 = 1
    TapButton2 = 3
    TapButton3 = 2
    ClickFinger1 = 1
    ClickFinger2 = 1
    ClickFinger3 = 1
    CircularScrolling = 0
    CircScrollDelta = 0.1
    CircScrollTrigger = 0
    CircularPad = 0
    PalmDetect = 0
    PalmMinWidth = 10
    PalmMinZ = 99
    CoastingSpeed = 20
    CoastingFriction = 50
    PressureMotionMinZ = 14
    PressureMotionMaxZ = 79
    PressureMotionMinFactor = 1
    PressureMotionMaxFactor = 1
    GrabEventDevice = 1
    TapAndDragGesture = 1
    AreaLeftEdge = 0
    AreaRightEdge = 0
    AreaTopEdge = 0
    AreaBottomEdge = 0
    JumpyCursorThreshold = 0