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Old 02-02-2012, 12:16 PM   #1
goncalopp
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synaptics - finger distance in two finger scrolling


I'm trying to configure a Synaptics touchpad with multitouch support. I've pretty much nailed it with the synaptics manpage and synclient, however, something's not quite right:

These devices support vertical scrolling by moving two fingers on the touchpad. In a old Ubuntu version, I could (out-of-the-box) do vertical
scrolling with the two fingers close together. Now, both in ubuntu and debian, scrolling only works if they are 0.5cm+ appart.

I realize it's a bit trivial of a problem, but (right) tapping with separated fingers is especially difficult.

I've looked at EmulateTwoFingerMinW, which seems to be relevant, but it makes no difference (maybe because this is a multitouch touchpad, so it uses no emulation?). I can't seem to find any more relevant configuration, and google is failing me

I appreciate your help
 
Old 02-07-2012, 12:23 PM   #2
SecretCode
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What versions of Ubuntu/Debian and the driver? This work fine for me on Kubuntu 11.10 with synaptiks: 0.7.0 and synclient 1.4.1

Also ... how tiny are your fingers?! Even pressed together my fingertips are >1.0cm apart.
 
Old 02-08-2012, 09:10 AM   #3
goncalopp
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Quote:
Also ... how tiny are your fingers?! Even pressed together my fingertips are >1.0cm apart.
Lol! I can see where you're coming from.
When I mentioned "apart", i meant it as opposed to "pressed together"; 1cm+ is the distance *between* the fingers (not fingertips). So, fingers pressed together would be 0cm.
One might rephrase the problem to "I can't scroll with my fingers pressed together".

Quote:
What versions of Ubuntu/Debian and the driver?
I was using Ubuntu 11.04, if I'm not mistaken. Currently on Debian wheezy (testing).
synclient is at 1.5.0, as is the package xserver-xorg-input-synaptics. I'm not sure what's the other program you're referring to.

Last edited by goncalopp; 02-08-2012 at 10:21 AM.
 
Old 02-08-2012, 12:30 PM   #4
SecretCode
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The other program, synaptiks, is a KDE-specific utility - you won't have that.

I can use two finger scroll with my fingers tightly pressed together ... 0.0cm separation

What does synclient -l show? I have no idea which setting controls multitouch scrolling but comparing your output with mine could yield a clue.

use code tags...
 
Old 02-09-2012, 08:47 AM   #5
goncalopp
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synclient:
Code:
Parameter settings:
    LeftEdge                = 1751
    RightEdge               = 5187
    TopEdge                 = 1626
    BottomEdge              = 4306
    FingerLow               = 25
    FingerHigh              = 30
    FingerPress             = 256
    MaxTapTime              = 180
    MaxTapMove              = 222
    MaxDoubleTapTime        = 180
    SingleTapTimeout        = 180
    ClickTime               = 100
    FastTaps                = 0
    EmulateMidButtonTime    = 75
    EmulateTwoFingerMinZ    = 282
    EmulateTwoFingerMinW    = 7
    VertScrollDelta         = 101
    HorizScrollDelta        = 101
    VertEdgeScroll          = 0
    HorizEdgeScroll         = 0
    CornerCoasting          = 0
    VertTwoFingerScroll     = 1
    HorizTwoFingerScroll    = 0
    MinSpeed                = 1
    MaxSpeed                = 1.75
    AccelFactor             = 0.0394867
    TrackstickSpeed         = 40
    EdgeMotionMinZ          = 30
    EdgeMotionMaxZ          = 160
    EdgeMotionMinSpeed      = 1
    EdgeMotionMaxSpeed      = 405
    EdgeMotionUseAlways     = 0
    TouchpadOff             = 0
    LockedDrags             = 0
    LockedDragTimeout       = 5000
    RTCornerButton          = 0
    RBCornerButton          = 0
    LTCornerButton          = 0
    LBCornerButton          = 0
    TapButton1              = 1
    TapButton2              = 3
    TapButton3              = 2
    ClickFinger1            = 1
    ClickFinger2            = 3
    ClickFinger3            = 2
    CircularScrolling       = 0
    CircScrollDelta         = 0.1
    CircScrollTrigger       = 0
    CircularPad             = 0
    PalmDetect              = 0
    PalmMinWidth            = 10
    PalmMinZ                = 200
    CoastingSpeed           = 20
    CoastingFriction        = 50
    PressureMotionMinZ      = 30
    PressureMotionMaxZ      = 160
    PressureMotionMinFactor = 1
    PressureMotionMaxFactor = 1
    GrabEventDevice         = 1
    TapAndDragGesture       = 1
    AreaLeftEdge            = 0
    AreaRightEdge           = 0
    AreaTopEdge             = 0
    AreaBottomEdge          = 0
current xorg.conf:
Code:
Section "InputClass"
        Identifier      "Touchpad"
        MatchIsTouchpad "yes" 
        Driver          "synaptics"
        Option          "TapButton1"            "1"
        Option          "TapButton2"            "3"
        Option          "TapButton3"            "2"
EndSection
Quote:
I have no idea which setting controls multitouch scrolling but comparing your output with mine could yield a clue.
It's both the scrolling and two finger tapping, so I think it wouldn't be a scroll specific option.
I'm not sure if X somehow autoconfigures the driver options...

Last edited by goncalopp; 02-09-2012 at 08:59 AM.
 
Old 02-09-2012, 12:13 PM   #6
SecretCode
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Comparing has not yielded any clues

This is what I get:
Code:
Parameter settings:
    LeftEdge                = 53
    RightEdge               = 1099
    TopEdge                 = 48
    BottomEdge              = 720
    FingerLow               = 24
    FingerHigh              = 29
    FingerPress             = 255
    MaxTapTime              = 180
    MaxTapMove              = 59
    MaxDoubleTapTime        = 180
    SingleTapTimeout        = 180
    ClickTime               = 100
    FastTaps                = 0
    EmulateMidButtonTime    = 75
    EmulateTwoFingerMinZ    = 280
    EmulateTwoFingerMinW    = 6
    VertScrollDelta         = 27
    HorizScrollDelta        = 27
    VertEdgeScroll          = 1
    HorizEdgeScroll         = 1
    CornerCoasting          = 0
    VertTwoFingerScroll     = 1
    HorizTwoFingerScroll    = 1
    MinSpeed                = 1
    MaxSpeed                = 1.75
    AccelFactor             = 0.1468
    TrackstickSpeed         = 40
    EdgeMotionMinZ          = 29
    EdgeMotionMaxZ          = 159
    EdgeMotionMinSpeed      = 1
    EdgeMotionMaxSpeed      = 108
    EdgeMotionUseAlways     = 0
    TouchpadOff             = 0
    LockedDrags             = 0
    LockedDragTimeout       = 5000
    RTCornerButton          = 2
    RBCornerButton          = 3
    LTCornerButton          = 0
    LBCornerButton          = 0
    TapButton1              = 1
    TapButton2              = 2
    TapButton3              = 3
    ClickFinger1            = 1
    ClickFinger2            = 1
    ClickFinger3            = 1
    CircularScrolling       = 0
    CircScrollDelta         = 0.100007
    CircScrollTrigger       = 0
    CircularPad             = 0
    PalmDetect              = 0
    PalmMinWidth            = 9
    PalmMinZ                = 199
    CoastingSpeed           = 20
    CoastingFriction        = 50
    PressureMotionMinZ      = 29
    PressureMotionMaxZ      = 159
    PressureMotionMinFactor = 1
    PressureMotionMaxFactor = 1
    ResolutionDetect        = 1
    GrabEventDevice         = 1
    TapAndDragGesture       = 1
    AreaLeftEdge            = 0
    AreaRightEdge           = 0
    AreaTopEdge             = 0
    AreaBottomEdge          = 0
 
Old 02-10-2012, 06:31 PM   #7
goncalopp
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And your options don't seem to have an effect on the problem here.
Ah well, I guess I'll start using the keyboard...

Thank you for all your help, SecretCode!
 
  


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