Comment 390 for bug 550625

On Sat, Sep 17, 2011 at 04:10:03PM -0000, César Izurieta wrote:
> Hi Seth, thanks a lot for the patches. On my computer (Dell Inspiron
> N5110, opensuse 11.4 kernel 3.0.4, just touchpad, no trackstick) it's
> working well. Just 3 problems:
>
> 1. When leaving my finger over the touchpad without movement, the cursor
> moves erratically ±1 pixel (but stays in the same place), maybe it does
> have something to do with sensitivity to high. I'll try to get the max X
> and Y and send them to you.

In my past experience this is fixed by some filtering added in newer
versions of the Xorg synaptics module. It doesn't really seem
appropriate to filter the hardware-reported values in the driver.

> 2. Sometimes when moving the cursor with one finger only on the
> touchpad, click events are fired, though I can't find a way to reproduce
> this.

I've seen something like this with two-finger touch. If the problem is
the same, it's caused by these occassional odd reports from the hardware
that the pressure is zero, and the next release of the driver will have
a fix in place.

> 3. I don't have a trackstick but two devices are registered:

That's just the way that the driver is already set up. In fact, when you
set ALPS_DUALPOINT to 0 you probably still get 2 devices, one is just
named "PS/2 mouse" or something similar. It won't cause any issues
though.