Hi Ulf and Kihaguru,
On Sun, Aug 09, 2026 at 01:57:37PM +0200, Ulf Brosziewski wrote:
> I try to summarize what I have read in this thread. You are dealing with
> two problems, which may be related, or simply co-occur:
> - Inputs from devices that report relative coordinates - that is, the
> trackpoint, and the touchpad in "non-native" mode - cause cursor jumps
> (only at the start of a movement, did I get that right?).
> - Occasionally, typing triggers a motion event (I assume that this, in
> turn, triggers a cursor jump because of the first problem).
That's close to correct, but not quite:
I *only* see jumps when typing. I.e., just moving my fingers on the
touchpad never triggers a jump.
> 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.)
For my first test I overlooked your suggestion to delete or rename
xorg.conf, and tested using
--- begin /etc/X11/xorg.conf ---
Section "InputClass"
Identifier "wsmouse touchpad"
Driver "synaptics"
MatchIsTouchpad "on"
EndSection
Section "InputDevice"
Identifier "TrackPoint and buttons"
Driver "ws"
Option "Device" "/dev/wsmouse2"
Option "AutoServerLayout" "true"
EndSection
--- end /etc/X11/xorg.conf ---
The result of rebooting and disabling both ims and pms as you suggest is:
* the touchpad works fine
* the mechanical touchpad buttons don't work (pressing them doesn't seem
to have any 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 an hour or so
(writing & debugging a small perl utility, then writing this message),
and no jumps at all!!
Next I'll try rebooting and disabling both ims and pms, with xorg.conf
renamed.....
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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