[Wayland-bugs] [Bug 99454] Elantech touchpad registers unwanted taps. Needs adjustable sensitivity.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99454

            Bug ID: 99454
           Summary: Elantech touchpad registers unwanted taps. Needs
                    adjustable sensitivity.
           Product: Wayland
           Version: 1.5.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: andrebrait at gmail.com

Created attachment 129036
  --> https://bugs.freedesktop.org/attachment.cgi?id=129036&action=edit
Recordings (the only tap registered was an accidental one)

Sometimes the touchpad registers unwanted taps. 

Happens in Windows as well with Dell's touchpad drivers as shipped in Windows
10 (version 15.3.1.1) but not with Elantech's own drivers (version 15.19.7.1).

It does happen with the X11 Synaptics drivers as well, but it's fixable by
setting higher values for FingerLow and FingerHigh (10 and 20 are the values
that work best for me). With libinput, however, there's no way to adjust the
sensitivity. With the X11 Synaptics drivers, these settings could be adjusted
by the DE as well (see KDE's input settings controls).

As consequence, I for times have accidentally unselected text, selected text,
clicked on buttons (sometimes leading to catastrophic consequences) and closed
windows (sometimes multiple windows that were maximized), etc. For this reason,
I'm classifying this bug as major. It can lead to user frustration and,
sometimes, disasters.

Device: Dell Vostro 5470 laptop
OS: Fedora Workstation Linux 25 x86-64
libinput version: 1.5.901-1.fc25
Touchpad Width: 112mm
Touchpad Height: 77mm
Touchpad type: clickpad


$ udevadm info /sys/class/input/event5 > udevinfo

N: input/event5
E: DEVNAME=/dev/input/event5
E: DEVPATH=/devices/platform/i8042/serio1/input/input6/event5
E: ID_BUS=i8042
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=71
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=106
E: LIBINPUT_ATTR_RESOLUTION_HINT=31x31
E: LIBINPUT_DEVICE_GROUP=11/2/e/0:isa0060/serio1
E: LIBINPUT_MODEL_DELL_TOUCHPAD=1
E: LIBINPUT_MODEL_ELANTECH_TOUCHPAD=1
E: MAJOR=13
E: MINOR=69
E: SUBSYSTEM=input
E: USEC_INITIALIZED=17360073


$ cat /sys/class/dmi/id/modalias

dmi:bvnDellInc.:bvrA12:bd11/05/2015:svnDellInc.:pnVostro5470:pvr:rvnDellInc.:rn0DW7DY:rvrA00:cvnDellInc.:ct8:cvr0.1:

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