libinput 1.7.0, intermittently erratic touchpad

[Peter Hutterer]

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.

Cheers,
   Peter

> 
> 
> libinput-list-devices has a curiousity, even though gnome-shell tap to
> click is on, this says it's disabled.
> 
> 
> Device:           SynPS/2 Synaptics TouchPad
> Kernel:           /dev/input/event5
> Group:            8
> Seat:             seat0, default
> Size:             92x52mm
> Capabilities:     pointer
> Tap-to-click:     disabled
> Tap-and-drag:     enabled
> Tap drag lock:    disabled
> Left-handed:      disabled
> Nat.scrolling:    disabled
> Middle emulation: disabled
> Calibration:      n/a
> Scroll methods:   *two-finger edge
> Click methods:    *button-areas clickfinger
> Disable-w-typing: enabled
> Accel profiles:   none
> Rotation:         n/a
> 
> [chris at f26h ~]$ udevadm info /dev/input/event5
> P: /devices/platform/i8042/serio1/input/input5/event5
> N: input/event5
> E: DEVNAME=/dev/input/event5
> E: DEVPATH=/devices/platform/i8042/serio1/input/input5/event5
> E: ID_BUS=i8042
> E: ID_INPUT=1
> E: ID_INPUT_HEIGHT_MM=51
> E: ID_INPUT_TOUCHPAD=1
> E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
> E: ID_INPUT_WIDTH_MM=92
> E: LIBINPUT_DEVICE_GROUP=11/2/7/1b1:isa0060/serio1
> E: LIBINPUT_MODEL_SYNAPTICS_SERIAL_TOUCHPAD=1
> E: MAJOR=13
> E: MINOR=69
> E: SUBSYSTEM=input
> E: USEC_INITIALIZED=3816082
> 
> 
> 
> $ sudo cat /sys/class/dmi/id/modalias
> 
> dmi:bvnInsyde:bvrF.31:bd02/21/2017:svnHP:pnHPSpectreNotebook:pvrType1ProductConfigId:rvnHP:rn81A0:rvr48.54:cvnHP:ct10:cvrChassisVersion:
> 
> Thanks,
> 
> -- 
> Chris Murphy
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