[Bug 222609] x11-servers/xorg-server: Add UDEV option to support evdev devices autodetection

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222609

--- Comment #32 from Ivan <bsd at abinet.ru> ---
Thank you!
I hope resolution values are not needed elsewhere.

Touchpad works, I added some hints for better usability

Section "InputClass"
    Identifier "touchpad"
    MatchIsTouchpad "on"
    Option "TransformationMatrix" "1 0 0 0 1 0 0 0 0.7"
    Option "Tapping" "on"
    Option "ScrollMethod" "edge"
EndSection

TransformationMatrix boosts speed slightly. I was unable to adjust it in xfce
configuration.

[  3691.584] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad
(/dev/input/event3)
[  3691.584] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "libinput
pointer catchall"
[  3691.584] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "libinput
touchpad catchall"
[  3691.584] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "touchpad"
[  3691.584] (II) Using input driver 'libinput' for 'SynPS/2 Synaptics
TouchPad'
[  3691.584] (**) SynPS/2 Synaptics TouchPad: always reports core events
[  3691.584] (**) Option "Device" "/dev/input/event3"
[  3691.584] (**) Option "_source" "server/udev"
[  3691.799] (II) input device 'SynPS/2 Synaptics TouchPad', /dev/input/event3
is tagged by udev as: Mouse Touchpad
[  3691.799] (II) SynPS/2 Synaptics TouchPad: no resolution or size hints,
assuming a size of 69x50mm
[  3691.799] (II) input device 'SynPS/2 Synaptics TouchPad', /dev/input/event3
is a touchpad
[  3691.834] (**) Option "Tapping" "on"
[  3691.834] (**) Option "ScrollMethod" "edge"
[  3691.834] (**) Option "config_info" "udev:/dev/input/event3"
[  3691.834] (II) XINPUT: Adding extended input device "SynPS/2 Synaptics
TouchPad" (type: TOUCHPAD, id 9)
[  3691.834] (**) Option "AccelerationScheme" "none"
[  3691.834] (**) SynPS/2 Synaptics TouchPad: (accel) selected scheme none/0
[  3691.834] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration factor:
2.000
[  3691.834] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration threshold: 4
[  3691.834] (**) Option "TransformationMatrix" "1 0 0 0 1 0 0 0 0.7"
[  3692.054] (II) input device 'SynPS/2 Synaptics TouchPad', /dev/input/event3
is tagged by udev as: Mouse Touchpad
[  3692.054] (II) SynPS/2 Synaptics TouchPad: no resolution or size hints,
assuming a size of 69x50mm
[  3692.054] (II) input device 'SynPS/2 Synaptics TouchPad', /dev/input/event3
is a touchpad

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