Middle trackpoint button press only registers on release

yakutori

yakutori

I am trying to use the Acme editor, that depends a lot on mouse cording. One such cord is to press button 1 (left mouse button) while button 2 (middle) is pressed.

This does not work and using xev, I discovered that button 2 registers both the press and release events on release only.

To be clear: when button 2 is pressed, xev outputs nothing, but when it is released, it outputs two events for the button, one with pressed state and the next with released state, with the same timestamp.

What could be causing that?

Output of xinput list:

Code: 
⎡ Virtual core pointer                        id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                  id=4    [slave  pointer  (2)]
⎜   ↳ System mouse                                id=6    [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                  id=10    [slave  pointer  (2)]
⎜   ↳ TPPS/2 IBM TrackPoint                       id=11    [slave  pointer  (2)]
⎣ Virtual core keyboard                       id=3    [master keyboard (2)]  
     ↳ Virtual core XTEST keyboard                 id=5    [slave  keyboard (3)]  
     ↳ System keyboard multiplexer                 id=7    [slave  keyboard (3)]  
     ↳ Sleep Button                                id=8    [slave  keyboard (3)]  
     ↳ AT keyboard                                 id=9    [slave  keyboard (3)]

and xinput --list-props 11:

Code: 
Device 'TPPS/2 IBM TrackPoint': Device Enabled (175):    1
Coordinate Transformation Matrix (176):    1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Natural Scrolling Enabled (299):    0
libinput Natural Scrolling Enabled Default (300):    0
libinput Scroll Methods Available (301):    0, 0, 1
libinput Scroll Method Enabled (302):    0, 0, 1
libinput Scroll Method Enabled Default (303):    0, 0, 1
libinput Button Scrolling Button (304):    2
libinput Button Scrolling Button Default (305):    2
libinput Button Scrolling Button Lock Enabled (306):    0
libinput Button Scrolling Button Lock Enabled Default (307):    0
libinput Middle Emulation Enabled (308):    0
libinput Middle Emulation Enabled Default (309):    0
libinput Accel Speed (310):    0.000000
libinput Accel Speed Default (311):    0.000000
libinput Accel Profiles Available (312):    1, 1
libinput Accel Profile Enabled (313):    1, 0
libinput Accel Profile Enabled Default (314):    1, 0
libinput Left Handed Enabled (315):    0
libinput Left Handed Enabled Default (316):    0
libinput Send Events Modes Available (317):    1, 0
libinput Send Events Mode Enabled (318):    0, 0
libinput Send Events Mode Enabled Default (319):    0, 0  
Device Node (320):    "/dev/input/event6"    Device Product ID (321):    2, 10
libinput Drag Lock Buttons (322):
libinput Horizontal Scroll Enabled (323):    1
libinput Scrolling Pixel Distance (324):    15
libinput Scrolling Pixel Distance Default (325):    15

This is on a ThinkPad T470p, running FreeBSD 13.1-RELEASE.
 
Hello!

I noticed a similar issue on my Thinkpad P53 and managed to find a workaround.

I believe this is related to the "Scroll Method Enabled (302)," set to 0, 0, 1 indicating "button," which enables you to scroll by holding down the middle TrackPoint button and moving the cursor with the nub (note that this is independent of similar settings, e.g., in browsers where you can hold down the mousewheel and move the mouse for scrolling).

I managed to fix this issue by setting "ScrollMethod" to "none" in a config file in /etc/X11/xorg.conf.d/.

This does disable button scrolling with the TrackPoint, but it allows the system to properly register press and release events with the middle TrackPoint button.

Hope this helps.
 
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