Fixed in libinput master. Not sure when the fix will be released...
commit 1523d8bb2e066bec297f7a03ce4a0d8cada8f383
Author: Peter Hutterer <[email protected]>
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 <[email protected]>
commit 1b64888a2248af2a287365598cf520e4e2be33fd
Author: Peter Hutterer <[email protected]>
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 <[email protected]>
** 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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https://bugs.launchpad.net/bugs/1749689
Title:
Lenovo Yoga 11S touchpad is jittery
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