Issuing those two commands found on Arch wiki:

echo -n "none" | sudo tee /sys/bus/serio/devices/serio1/drvctl
echo -n "reconnect" | sudo tee /sys/bus/serio/devices/serio1/drvctl

Both devices work again. New dmesg output:

[ 1903.992439] psmouse serio1: synaptics: queried max coordinates: x [..5678], 
y [..4758]
[ 1904.029309] psmouse serio1: synaptics: queried min coordinates: x [1266..], 
y [1094..]
[ 1904.029321] psmouse serio1: synaptics: Trying to set up SMBus access
[ 1904.032224] psmouse serio1: synaptics: SMbus companion is not ready yet
[ 1904.103581] psmouse serio1: synaptics: Touchpad model: 1, fw: 9.16, id: 
0x1e2a1, caps: 0xf00ba3/0x940300/0x12e800/0x500000, board id: 3288, fw id: 
2696789
[ 1904.103599] psmouse serio1: synaptics: serio: Synaptics pass-through port at 
isa0060/serio1/input0
[ 1904.149083] input: SynPS/2 Synaptics TouchPad as 
/devices/platform/i8042/serio1/input/input34
[ 1910.230562] psmouse serio1: synaptics: queried max coordinates: x [..5678], 
y [..4758]
[ 1910.278909] psmouse serio1: synaptics: queried min coordinates: x [1266..], 
y [1094..]
[ 1910.760287] psmouse serio3: Failed to reset mouse on synaptics-pt/serio0: -5
[ 1911.368284] psmouse serio3: trackpoint: Elan TrackPoint firmware: 0x04, 
buttons: 3/3
[ 1911.655673] input: TPPS/2 Elan TrackPoint as 
/devices/platform/i8042/serio1/serio3/input/input36

xinput reports the trackpoint again as Elan device, not generic:

⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=11   [slave  pointer  (2)]
⎜   ↳ TPPS/2 Elan TrackPoint                    id=13   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Sleep Button                              id=8    [slave  keyboard (3)]
    ↳ Integrated Camera: Integrated C           id=9    [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=10   [slave  keyboard (3)]
    ↳ ThinkPad Extra Buttons                    id=12   [slave  keyboard (3)]

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https://bugs.launchpad.net/bugs/1799066

Title:
  Trackpoint/trackpad unusable when trying to install 18.10 on X1 Carbon
  6th

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