[Solved] pointer customization lost after "udevadm trigger"

[GNUser]

I've noticed that loading any extension whose  tce.installed  script contains this line:

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udevadm triggerCauses my pointer/trackpoint customization to be lost. The customization is achieved with this command at boot:

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xinput set-prop 'TPPS/2 IBM TrackPoint' 'libinput Accel Speed' -0.4Currently, my poor-man's workaround is to re-run the  xinput  command after loading such extensions.

Please, how do I make the pointer customization permanent? My guess is that it would be with either a special udevadm rule or an xorg config file, but I'm not sure what would be the appropriate syntax or file to modify.

[Juanito]

I assume you could do it with an xorg.conf snippet in /usr/local/share/X11/xorg.conf.d - there's already an example in there

[GNUser]

Thank you, juanito. I tried changing this snippet in /usr/local/share/X11/xorg.conf.d/40-libinput.conf:

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Section "InputClass"
        Identifier "libinput pointer catchall"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection
To this:

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Section "InputClass"
        Identifier "libinput pointer catchall"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
Option "libinput Accel Speed" "-0.4"
EndSection
and this:

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Section "InputClass"
        Identifier "libinput pointer catchall"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
Option "Accel Speed" "-0.4"
EndSection
and this:

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Section "InputClass"
        Identifier "libinput pointer catchall"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
Option "AccelSpeed" "-0.4"
EndSection
Alas, no joy--"udevadm trigger" causes the pointer to become unusable for me. Maybe a adding or modifying a udev rule would do the trick? Unfortunately, libinput is new to me as of TCL11 so I have no prior experience working with it.

[GNUser]

Juanito, you were right (as usual). It was a matter of using the correct syntax right AND restarting X, which I forgot to do.

I created a file called  /usr/local/share/X11/xorg.conf.d/52-trackpoint-tweaks.conf  with this in it:

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Section "InputClass"
    Identifier         "Trackpoint tweaks"
    MatchProduct       "TPPS/2 IBM TrackPoint"
    MatchDevicePath    "/dev/input/event*"
    Driver             "libinput"
    Option             "AccelSpeed"      "-0.4"
EndSection

Then:

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$ pkill -f X
$ startx
Now, the command "udevadm trigger" causes no changes in my trackpoint

Solved!

[GNUser]

Juanito, if you'll indulge me with a question, I'd like to learn a nugget from this:
Why does "udevadm trigger" undo/break trackpoint's customization done via the xinput command, but has no effect if customization is done via /usr/local/share/X11/xorg.conf.d?

[Juanito]

I don't know for sure - maybe @curaga can help?

[curaga]

xinput applies settings to one device at runtime. Running udevadm may cause X to think the mouse was disconnected and reconnected, and X may think it's a new device. No inheriting old runtime options. However options from the config file are applied to all such new devices.

[GNUser]

That makes sense and would definitely explain the observations. Thanks, curaga