Comment 70 for bug 308191

@Dana Goyette

There's an easy way to determine in Windows if your trackpad is emulating multitouch or providing real hardware multitouch on newer laptops (running newer trackpad firmware): Open up your Mouse control panel, then press shift+alt+i. This will open a debug window. From there, go to the device0 tab, and look near the bottom for - and i might have the name wrong here - Finger Sensing (#). This value will show you how many fingers the driver is reporting. Now, watch this number while you apply contact to the pad in several different ways. First, touch the pad with two fingers spaced a little bit apart. Next, touch the pad with 3 or 4 fingers spaced with as little space between them as possible. Next, try pressing the entire side of your finger to the pad at once. Does it show more than 1 contact point when you try the second two methods? If so, then the firmware is taking any wide-area contact to the trackpad and assuming that the two edges of the contact area are your two separate fingers, meaning that it is emulating multitouch

I would also note that, strangely, with the updates from a few nights ago, the "spazz" behavior I was previously seeing when I would multi-touch my trackpad has stopped. Touching the trackpad with two fingers now produces normal single-touch mousing behavior.