ubuntu-x-swat team mailing list archive

[Richard Cavell <richardcavell@xxxxxxxx>]

Public bug reported:

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.

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

** Affects: xserver-xorg-input-synaptics (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: laptop synaptics touchpad trackpad

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