Bug 203897

Summary:	Thinkpad A275 trackpoint buttons do not recognize "pressed" state
Product:	Drivers	Reporter:	Bjoern Franke (bjo)
Component:	Input Devices	Assignee:	drivers_input-devices
Status:	NEW ---
Severity:	normal	CC:	acjones8
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	5.1.9	Subsystem:
Regression:	No	Bisected commit-id:

Description Bjoern Franke 2019-06-14 18:39:51 UTC

I got a Thinkpad A275 which has a trackpad and a trackpoint. Pressing the trackpoint buttons is only recognized as "click" and not for the time being pressed. xev shows ButtonReleased immediately after ButtonPressed, so it's impossible to mark text or scroll via the middle button.

A workaround is to add proto=exps which disables some features. psmouse.synaptics_intertouch does not to have an effect on this issue.

dmesg for broken state:
[   12.770054] psmouse serio1: synaptics: queried max coordinates: x [..5712], y [..4780]
[   12.803675] psmouse serio1: synaptics: queried min coordinates: x [1232..], y [1074..]
[   12.803685] psmouse serio1: synaptics: Your touchpad (PNP: LEN2053 PNP0f13) says it can support a different bus. If i2c-hid and hid-rmi are not used, you might want to try setting psmouse.synaptics_intertouch to 1 and report this to linux-input@vger.kernel.org.
[   12.860351] psmouse serio1: synaptics: Touchpad model: 1, fw: 8.16, id: 0x1e2b1, caps: 0xf40aa3/0x943300/0x12e800/0x410000, board id: 3075, fw id: 2622508
[   12.860365] psmouse serio1: synaptics: serio: Synaptics pass-through port at isa0060/serio1/input0
[   12.900909] input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio1/input/input10
[   12.916804] mousedev: PS/2 mouse device common for all mice
[   13.593833] psmouse serio2: trackpoint: IBM TrackPoint firmware: 0x0e, buttons: 3/3
[   13.816399] input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/serio2/input/input20

xinput:
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad              	id=12	[slave  pointer  (2)]
⎜   ↳ TPPS/2 IBM TrackPoint                   	id=13	[slave  pointer  (2)]

Comment 1 Alexander Jones 2020-02-09 06:58:19 UTC

I have this exact laptop and suffer from this exact same bug. The proto=exps allows the buttons to work fine and they no longer immediately generate a Release event in XEV regardless of how long they're held, but the TrackPad loses two finger scrolling, and xinput no longer recognizes the Trackpoint as a pointing device. I have kernel version 5.4.14-2-default on OpenSUSE Tumbleweed at the moment.