Re: Touchpad problems with latest kernels

Dmitry Torokhov
2006-08-14T19:27:55Z

On 8/14/06, Voluspa <lista1@comhem.se> wrote:
>
> On 2006-08-14 13:58:09 Luke Sharkey wrote:
> > While on 2054 it generally works fine, On the latest kernels (2154,
> > 2174 etc.) I have only to e.g. open a konqueror window for the
> > onscreen pointer to start going funny, and jerking about (As happens on
> > computers with v. low RAM). I know its not a RAM problem, as a)
> > everything else works fine, there is no slow down of any of the
> > programs I run, only problems with the mouse and b) I have just
> > upgraded from 512 MB of RAM to 1 GB.
> >
> > If I plug in a mouse, the pointer works fine. Though I would happily
> > use a mouse, this is often inconvenient on a laptop.
> >
> > Do you have any ideas what's wrong?
>
> This is a known problem (and fixed in Windows) with the synaptics touch
> pad. About one year ago I did a web search amounting to something like
> "synaptics rubber band" and found a fixed windows driver. But since
> there is no OS of that kind on this machine, I contacted the developer
> of the synaptics X driver.
>
> We had a discussion (swedish only) in private mail, where I ran the
> driver in debug mode - he no longer had a machine with that hardware.
> Unfortunately I've lost the whole communication due to a voltage frying
> of everything in the mail machine, so can not give any details.
>
> If Peter Österlund still has the e-mails I hereby give full permission
> to disclose a translated copy to anyone interested.
>
> But I think it all came down to Peter not being able to do anything...
> In earlier kernels the issue _seemed_ to lessen if booting with
> i8042.nomux but nowadays that kernel option only gets rid of the 'lost
> sync' messages from the pad that turn up in /var/log/messages
> (Btw, excessive printing of that message Dmitry!)
>

Hmm, have you tried lowering report rate of the synaptics driver
(psmouse.rate=40)? 80 ppsm is quite high and I know some Toshibas have
trouble handling the full rate...

--
Dmitry