Bug 105485

Summary: Add hwdb entry for X280 trackpoint (too fast)
Product: Wayland Reporter: Benjamin Berg <benjamin>
Component: libinputAssignee: Wayland bug list <wayland-bugs>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: medium CC: bugra, bugzilla, peter.hutterer
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Benjamin Berg 2018-03-13 13:05:13 UTC 
The trackpoint on the X280 is too fast. I first thought that adding an entry to the systemd hwdb is correct, but changing the acceleration to 64 there improves things only until libinput also reads the property.

https://github.com/systemd/systemd/pull/8442 has the relevant matching rules for the machine.

The libinput-measure-trackpoint-range utility seems to suggest a value of 70 for  the machine. Though, to be honest, it is hard to tell how much one is supposed to press. Doesn't feel perfect, but I am not a big trackpoint user, so might be misinterpreting things.

Rule:
libinput:name:*ALPS TrackPoint*:svnLENOVO:*:pvrThinkPadX280:*
  LIBINPUT_ATTR_TRACKPOINT_RANGE=70
Comment 1 Peter Hutterer 2018-03-14 05:02:06 UTC 
Did you measure that with the systemd PR there or without? It'll change the range available so the numbers are garbage otherwise
Comment 2 Benjamin Berg 2018-03-14 10:20:08 UTC 
Got confused a bit at first, but the measurement was without the sensitivity scaling in the end.
Comment 3 Peter Hutterer 2018-03-23 04:20:37 UTC 
commit 9d7f48b66aad8f985212ca3f6e31fc6e84caee90
Author: Peter Hutterer <>
Date:   Thu Mar 22 14:29:37 2018 +1000

     udev: add trackpoint range for Lenovo X280

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