Comment 6 for bug 356317

It sounds like they have something similar to a palm detect algorithm that applies only to the bottom of the touchpad.

The other issue here is that this kernel driver is not only used for the Macbook(Pro)5,x machines. It is also used for the MacbookPro4,1 (which has an actual button). It might be an ugly way to do it, but we may need to look at spiltting the driver functions based on the specific hardware ID... Most of this doesn't apply to the MacBookPro4,1 and it may cause issues there because something is now working better on the 5,x machines. So, before commiting these patches, we need to make sure that someone tests on MacBookPro4,1 hardware too.