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[Bug 381884] Re: Appletouch touchpad driver produces jumpy two-fingered scrolling
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Appletouch touchpad driver produces jumpy two-fingered scrolling
Status in Mactel Support:
Status in xserver-xorg-input-synaptics package in Ubuntu:
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 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.
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