> Hi Ulf and Kihaguru,

> it might be useful to start testing with a minimal setup.  You could
> delete or rename your xorg.conf, reboot the laptop, and disable ims and
> pms in the kernel:
> 
> At the boot prompt, enter
>   > boot -c
> and at the UKC prompt:
>   UKC> disable ims
>   UKC> disable pms
>   UKC> quit
> (The changes to the kernel configuration are temporary.)

When I do this *every* touchpad movement causes the cursor to jump.
However, typing does NOT cause the cursor to jump.

If I restore my "original" xorg.conf,
--- begin /etc/X11/xorg.conf ---
Section "InputClass"
        Identifier "wsmouse touchpad"
        Driver "synaptics"
        MatchIsTouchpad "on"
EndSection
--- end /etc/X11/xorg.conf ---
then I get the same result as my previous test: 
* the touchpad works fine
* the mechanical touchpad buttons don't work (pressing them doesn't seem
  to have any effect)
* the trackpoint ("nipple") has no effect
* clicking anywhere along the bottom of the touchpad produces the same
  actions I have bound to the left touchpad button
* the cursor no longer jumps!!  I've been typing for a half-hour or so
  and no jumps at all!!

So, definite progress -- thanks 1L<<20 for all your suggestions!

Next (later today) I'll try rebooting and disabling just one of {ims,pms}.

ciao,
-- 
-- "Jonathan Thornburg [remove -color to reply]" <[email protected]>
   he/him; on the west coast of Canada; https://www.bkis-orchard.net/
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