[Bug 1749689] Re: Lenovo Yoga 11S touchpad is jittery

[Daniel van Vugt]

Kind of fix released...
https://bugs.freedesktop.org/show_bug.cgi?id=105675

** Bug watch added: freedesktop.org Bugzilla #105675
   https://bugs.freedesktop.org/show_bug.cgi?id=105675

** Changed in: libinput (Ubuntu)
   Status: In Progress => Fix Released

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Title:
  Lenovo Yoga 11S touchpad is jittery

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[Bug 1749689] Re: Lenovo Yoga 11S touchpad is jittery

[Simon]

This is fixed for me in the latest set up 18.04 updates. It's wonderful.

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Title:
  Lenovo Yoga 11S touchpad is jittery

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[Bug 1749689] Re: Lenovo Yoga 11S touchpad is jittery

[Daniel van Vugt]

Fixed in libinput master. Not sure when the fix will be released...

commit 1523d8bb2e066bec297f7a03ce4a0d8cada8f383
Author: Peter Hutterer 
Date:   Mon Mar 5 13:17:43 2018 +1000

Extract and reset the abs fuzz value for the x/y axes

The kernel fuzz handling is buggy, especially when we want to rely on the 
fuzz
value for our hysteresis. But since this is a hw property and (at least
sometimes) set by the driver, we can't make this a pure libinput hwdb set
either.

So our workaround is:
* extract the (non-zero) fuzz into a udev property so we don't lose it
* set the fuzz to 0 to disable the in-kernel hysteresis
* overwrite our internal absinfo with the property fuzz

This way we get to use the hw-specified fuzz without having the kernel muck
around with it. We also get to use the EVDEV_ABS_ values in 60-evdev.hwdb to
override a driver-set fuzz.

Two drawbacks:
- we're resetting the kernel fuzz to 0, this affects any other users of the
  device node. That's probably a minor impact only.
- we can only save this in a udev property there's a risk of this 
information
  getting lost when playing around with udev rules. That too should be a 
minor
  issue.

https://bugs.freedesktop.org/show_bug.cgi?id=105303

Signed-off-by: Peter Hutterer 

commit 1b64888a2248af2a287365598cf520e4e2be33fd
Author: Peter Hutterer 
Date:   Fri Feb 23 11:44:23 2018 +1000

touchpad: enable hysteresis based on a 0 fuzz value

If the fuzz is 0, assume we don't need hysteresis and use the wobble 
detection
code instead. If the fuzz is non-zero, enable it by default.

Signed-off-by: Peter Hutterer 


** Bug watch added: freedesktop.org Bugzilla #105303
   https://bugs.freedesktop.org/show_bug.cgi?id=105303

** Changed in: libinput (Ubuntu)
   Status: Triaged => In Progress

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  Lenovo Yoga 11S touchpad is jittery

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[Bug 1749689] Re: Lenovo Yoga 11S touchpad is jittery

[Daniel van Vugt]

^^^
I think libinput 1.11.0 or 1.10.3 will contain the fix.

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Title:
  Lenovo Yoga 11S touchpad is jittery

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[Bug 1749689] Re: Lenovo Yoga 11S touchpad is jittery

[Bug Watch Updater]

** Changed in: libinput
   Status: Confirmed => Fix Released

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Title:
  Lenovo Yoga 11S touchpad is jittery

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[Bug 1749689] Re: Lenovo Yoga 11S touchpad is jittery

[Bug Watch Updater]

** Changed in: libinput
   Status: Unknown => Confirmed

** Changed in: libinput
   Importance: Unknown => Medium

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Title:
  Lenovo Yoga 11S touchpad is jittery

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