Comment 23 for bug 381884

Sorry, nothing has changed. I think we'd need someone with more experience
with weighting touchpad sensor values. The current algorithm just isn't
working right. Either this is only a very specific problem to only a few
hardware configurations OR I'm just so used to smooth apple trackpad in OS X
that I'm spoiled...

Blaine

On Thu, Jul 15, 2010 at 1:47 PM, jack fleming <email address hidden>wrote:

> I just installed Lucid on my macbook 4,1 and have this issue with 2
> finger scrolling. To annoying to use it with this bug, a real shame
> since everything else works as expected.
>
> Is there any status updates on a fix. I am willing to test things if
> needed.
>
> Jack
>
> --
> Appletouch touchpad driver produces jumpy two-fingered scrolling
> https://bugs.launchpad.net/bugs/381884
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in The Linux Kernel: New
> Status in Mactel Support: New
> Status in “xserver-xorg-input-synaptics” package in Ubuntu: Confirmed
>
> Bug description:
> 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.
>
> Richard
>
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