On Sun, Dec 31, 2017 at 01:37:15AM +0800, Aaron Ma wrote:
> I don't have X1C5 now, but give a quick test on: X1 Yoga 3rd with
> trackpoint (LEN009a), X1 yoga is pretty similar as X1 Carbon on
> trackpoint/touchpad.
Aha, now we’re getting somewhere. Mine actually is LEN0072 (as far as I
can tell from the ACPI DSDT), and the Windows update utility says:
| Pst Vendor : Elan
| [ERROR]: This TrackPoint is Elan (ID:03)
In [1], there are people mentioning that newer Trackpoints changed their
ID from LEN0073 to LEN0072, and a patch[2] for adding that to the RMI
whitelist has been proposed.
Either way, I don’t believe that trackpoint.c is the right driver for
this Trackpoint. Some values are indeed changeable in sysfs, however
without noticeable effect. Setting “thresh” causes the same error as
setting speed; I didn’t check the remaining properties.
> When trackpoint(without the commit) is recognized as "PS/2 Generic
> Mouse", scroll mode does *NOT* work.
I’m not making that up. It does work. And libinput also knows about scrolling.
% xinput list-props "PS/2 Generic Mouse"
Device 'PS/2 Generic Mouse':
Device Enabled (142): 1
Coordinate Transformation Matrix (144): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Natural Scrolling Enabled (315): 0
libinput Natural Scrolling Enabled Default (316): 0
libinput Left Handed Enabled (317): 0
libinput Left Handed Enabled Default (318): 0
libinput Accel Speed (319): 0.000000
libinput Accel Speed Default (320): 0.000000
libinput Accel Profiles Available (321): 1, 1
libinput Accel Profile Enabled (322): 1, 0
libinput Accel Profile Enabled Default (323): 1, 0
libinput Scroll Methods Available (324): 0, 0, 1
libinput Scroll Method Enabled (325): 0, 0, 1
libinput Scroll Method Enabled Default (326): 0, 0, 1
libinput Button Scrolling Button (327): 2
^^^^^^^^^^^^^^^^^^^^^^^
libinput Button Scrolling Button Default (328): 2
libinput Middle Emulation Enabled (329): 0
libinput Middle Emulation Enabled Default (330): 0
libinput Send Events Modes Available (265): 1, 0
libinput Send Events Mode Enabled (266): 0, 0
libinput Send Events Mode Enabled Default (267): 0, 0
Device Node (268): "/dev/input/event2"
Device Product ID (269): 2, 1
libinput Drag Lock Buttons (331): <no items>
libinput Horizontal Scroll Enabled (332): 1
%
1: https://forums.lenovo.com/t5/forums/v3_1/forumtopicpage/board-id/Special_Interest_Linux/thread-id/9645/page/16
2: https://lkml.org/lkml/2017/8/18/861
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