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Thread: Macbook touchpad cursor moving "in steps"

  1. #1
    Join Date
    May 2008
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    10

    Question Macbook touchpad cursor moving "in steps"

    Hi,

    I already accidently posted a similar post in the Apple Intel Archive (I was directly linked to it and didn't realize it was an archive... sorry for that) and was suggested to search this forum, as a few people had similar issues. I couldn't find anything useful and so I thought it's a good idea to post it once again here

    If I try to configure my touchpad behaviour I always notice the following no matter what I change: The cursor in mac os smoothly moves in a straigt line from one edge to the other if I drag my finger diagonally... In ubuntu, the cursor first moves right, then down, then right, then down, like drawing small steps... it's really annoying and makes navigation in a menu quite a task...

    Here are some pictures to clarify:

    mac os cursor movement:
    Code:
    \
     \
      \
    ubuntu cursor movement:
    Code:
    |
     -
      |
       -
    I don't know if this is a driver or configuration issue... I used (and tried to tweak) the configuration from this link: https://help.ubuntu.com/community/Ma...ae7d325138b8cb

    Anyone knows how to solve this? Or, as an alternative, anyone with a santa rosa c2d macbook (macbook3,1) who doesn't have this problem willing to post his/her xorg.conf?

    cu,
    peter
    Last edited by attenpeter; May 31st, 2008 at 01:18 PM. Reason: fixed typo

  2. #2
    Join Date
    Nov 2006
    Location
    Germany
    Beans
    96
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Macbook touchpad cursor moving "in steps"

    Hm, I am using this one on my MBP Santa Rosa (I think the touchpad is equal to those in the Macbooks):

    Code:
    Section "InputDevice" 
            Identifier "Synaptics Touchpad"
            Driver "synaptics"
    	 Option		"SendCoreEvents"	"true"
            Option "Device" "/dev/input/touchpad"
            Option "Protocol" "auto-dev"
            Option "VertScrollDelta" "20"
            Option "HorizScrollDelta" "350"
            Option "VertTwoFingerScroll" "true"
            Option "HorizTwoFingerScroll" "true"
            Option "FastTaps" "false"
            Option "TapButton2" "3"
            Option "AccelFactor" "0.3"
            Option "SHMConfig"  "on"
    EndSection
    Hope this helps...
    My little german ubuntu blog: http://ubuntu.macvillage.de/

  3. #3
    Join Date
    May 2008
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    10

    Re: Macbook touchpad cursor moving "in steps"

    Hi,

    I'll try this tomorrow and see if it works, although I'm quite sceptical as it is similar to my config...

    cu,
    peter

  4. #4
    Join Date
    May 2008
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    10

    Re: Macbook touchpad cursor moving "in steps"

    Well, unfortunately, the cursor movement still is like that...

  5. #5
    Join Date
    May 2008
    Beans
    10

    Re: Macbook touchpad cursor moving "in steps"

    nobody else? At least confirmations of this problem?

  6. #6
    Join Date
    Aug 2005
    Location
    Huntsville, AL, USA
    Beans
    7,526
    Distro
    Ubuntu

    Re: Macbook touchpad cursor moving "in steps"

    Quote Originally Posted by attenpeter View Post
    nobody else? At least confirmations of this problem?
    search in the forum archive as I am sure that someone has reported something similar before. It seems that adjusting values in the xorg.conf tends to fix it though.

  7. #7
    Join Date
    May 2006
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    2

    Re: Macbook touchpad cursor moving "in steps"

    hi there,

    I have a macbook3,1 and Im experiencing the exact same problem as attenpeter.

    Tore

  8. #8
    Join Date
    May 2008
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    10

    Re: Macbook touchpad cursor moving "in steps"

    Quote Originally Posted by cyberdork33 View Post
    search in the forum archive as I am sure that someone has reported something similar before. It seems that adjusting values in the xorg.conf tends to fix it though.
    I'm sorry, I searched a lot (here and google), tried A LOT of parameter tuning... The problem still exists

    My guess is that it is a macbook3,1 issue as other macbooks don't seem to be affected...

    I don't know, just a wild guess (I'm quite desperate), but the XNU kernel (mac os X kernel) is said to be open source; wouldn't it be possible to understand how the touchpad driver there works and implement/port it to a linux kernel? Or does apple use "binary driver modules" that prevent that?
    That is, IF this is a driver issue.....

  9. #9
    Join Date
    May 2006
    Beans
    2

    Re: Macbook touchpad cursor moving "in steps"

    I have also done quite a lot of synaptics tweaking with no solution. I am no synaptics guru, but I am feeling more and more confident that the problem might lay with the appletouch driver somehow. I have tried tweaking some params in that driver without really knowing too much about what I am doing, and with no results. It may be a problem with the way the driver calculates the current position.

  10. #10
    Join Date
    Oct 2005
    Beans
    127

    Re: Macbook touchpad cursor moving "in steps"

    Same problem here. Did anyone manage to fix it? Did you find values that work well in xorg.conf?

    Thanks,
    Tiago

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