[Bug 381884] Re: Appletouch touchpad driver produces jumpy two-fingered scrolling

[Richard Cavell]

** Description changed:

  Binary package hint: xserver-xorg-input-synaptics
  
  My system is: Linux richard-laptop 2.6.28-11-generic #42-Ubuntu SMP Fri
  Apr 17 01:58:03 UTC 2009 x86_64 GNU/Linux.  However, this issue applies
  to at least Intrepid and Jaunty, 32 and 64 bit, running on Apple Mac
  hardware that uses an Appletouch touchpad.  It has also been reported in
  the Gentoo and Debian forums.
  
  From what I can find on the Net, the Appletouch touchpad was first used
  in February 2005 for the G4 aluminium PowerBook, and last used for the
- 4th generation Intel Macbook and Macbook Pro in early 2008.  I would
- appreciate it if someone could find out exactly which machines use the
- Appletouch and modify this paragraph.
+ Macbook Pro in its 3rd generation, then 4th generation Intel Macbook in
+ early 2008.
  
  The issue is with two-fingered scrolling.  The Appletouch features the
  ability to detect two (or three) touches.  OS X uses this feature to
  enable scrolling, similar to a scrollwheel on a mouse.
  
  The synaptics driver causes the simulated scrollwheel to start moving as
  soon as one places a second finger on the touchpad.  That is to say,
  placing a second finger causes the trackpad driver to deliver scrolling
  signals, which means that attempts at vertical scrolling feels jumpy, or
  over sensitive.
  
  There was an update to the OS X driver that fixed this situation for
  Apple.  I guess that it detects the second finger and programmatically
  ignores the first few scrollticks, thereby 'deadening' the output.  This
  is what we need.
  
  The synaptics driver allows for some modification, but not for
  multitouch input.  This needs to be fixed at source code level.
  
  Richard

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Appletouch touchpad driver produces jumpy two-fingered scrolling
https://bugs.launchpad.net/bugs/381884
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