On Tue, 2008-11-25 at 18:54 -0500, Richard A. Smith wrote:
> During SJ's demo meeting today at 1cc I used my test machine with the
> new touchpad.
> The touchpad on my laptop is much deeper inset than
> I still experienced jumpyness. However, a much different jumpyness
> than what happens with the alps device. In my case it appears to happen
> if the tip of my thumb gets up into the active area. (Creepage from
> using it to click thThe touchpad on my laptop is much deeper inset than
> e X button) What I saw was the cursor would leap to the edge of the
> screen which is similar to what happens with the current pad, but unlike
> the current pad its does not continue to leap around. It a one shot and
> then returns to normal movement. This happened to me several times.
>
> So then I played with my HP laptop which also has a synaptics touchpad
> and I'm able to duplicate the same behavior.
It's worth a gander at the upstream synaptics driver; I've seen some
patches go by recently.
>
> So even with the new touchpad we still may have to have some sort of
> criteria for discarding packets with large deltas for the movement.
>
> By default in mouse mode the values reported by the device are relative.
> So some sort of edge effect must confuse the controller. I need to
> enable some logging and see what data the device actually sent.
>
> I've also noticed that the acceleration of the new touchpad is much less
> than the alps device. When you switch from new to old the you can
> really tell. We should reduce the acceleration of the cursor for the
> alps device. Its not necessary to be that fast.
>
Yeah, the acceleration stuff in X sucks. Fixed in next release, IIRC
(after something like 20 years...)
> Is that something we can set defaults for in the X config or do we have
> to detect what touchpad we are running?
>
Unfortunately, we'll have to detect it. This whole are of X is being
reworked as we speak Upstream, everything is hot plug, and you can
then set things on a per detected device basis.
- Jim
--
Jim Gettys <[EMAIL PROTECTED]>
One Laptop Per Child
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