libinput 1.7.0, intermittently erratic touchpad

Chris Murphy lists at
Tue Apr 4 23:01:53 UTC 2017

On Tue, Apr 4, 2017 at 4:36 PM, Peter Hutterer <peter.hutterer at> wrote:
> On Tue, Apr 04, 2017 at 12:33:32PM -0600, Chris Murphy wrote:
>> Before filing a bug...
>> I'm having tap to click annoyances. When typing, the cursor insert
>> point changes somewhere else, and suddenly I'm typing where I don't
>> want to be; a nearby background application gets "palm tapped" and
>> becomes foreground. That sort of thing. So it's taken some getting
>> used to with Fedora 25 but usually I prefer tap to click enabled; but
>> since upgrading a couple days ago to Fedora 26 which has libinput 1.7
>> it's gotten much more erratic. The problem stops if I turn off "tap to
>> click" in gnome-shell preferences. I'm guessing that there's just too
>> much sensitivity and contact of my thumb palm to the edge surface of
>> the touchpad is causing this erratic behavior. So I'm curious if
>> there's a way to make it less sensitive or if there's even a bug here.
> definitely maybe :) This is something I can't answer without seeing an
> evemu-record output from such a touch, but that's better attached to a
> bugreport than email.
> What I do assume is that the device's pressure values are different to the
> ranges we set up - that would explain the changes when updating to 1.7.
> an evemu recording of a few normal one-finger touch sequences will help with
> that.

Two captures attached. 30 seconds of normal touching. And a few hours
that includes palm touches that are causing aberrant behavior.

Chris Murphy

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