Here's the xinput properties for the trackpoint. It looks like the
scroll method should be set to button (the third bit is 1) but it
doesn't actually work.
$ xinput --list-props 12
Device 'TPPS/2 IBM TrackPoint':
Device Enabled (140): 1
Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000,
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Accel Speed (313): 0.000000
libinput Accel Speed Default (314): 0.000000
libinput Accel Profiles Available (315): 1, 1
libinput Accel Profile Enabled (316): 1, 0
libinput Accel Profile Enabled Default (317): 1, 0
libinput Natural Scrolling Enabled (318): 0
libinput Natural Scrolling Enabled Default (319): 0
libinput Send Events Modes Available (261): 1, 0
libinput Send Events Mode Enabled (262): 0, 0
libinput Send Events Mode Enabled Default (263): 0, 0
libinput Left Handed Enabled (320): 0
libinput Left Handed Enabled Default (321): 0
libinput Scroll Methods Available (322): 0, 0, 1
libinput Scroll Method Enabled (323): 0, 0, 1
libinput Scroll Method Enabled Default (324): 0, 0, 1
libinput Button Scrolling Button (325): 2
libinput Button Scrolling Button Default (326): 2
libinput Middle Emulation Enabled (327): 0
libinput Middle Emulation Enabled Default (328): 0
Device Node (264): "/dev/input/event6"
Device Product ID (265): 2, 10
libinput Drag Lock Buttons (329): <no items>
libinput Horizontal Scroll Enabled (330): 1
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https://bugs.launchpad.net/bugs/1690443
Title:
Trackpoint middle button scroll is not working after upgrading to
17.04
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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-libinput/+bug/1690443/+subscriptions
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