[Wayland-bugs] [Bug 99777] Lid switch monitoring occasionally gives false positives, erroneously disabling the internal touchpad

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99777

            Bug ID: 99777
           Summary: Lid switch monitoring occasionally gives false
                    positives, erroneously disabling the internal touchpad
           Product: Wayland
           Version: 1.5.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: pointedstick at zoho.com

Hardware: HP Spectre x360 (Kaby Lake, late 2016)
Software: Fedora 25 + GNOME 3.22.2 + libinput 1.6.0-2.fc25

Every since libinput added lid switch support to disable the internal touchpad
(in 1.6.0, I believe), I've had periodic issues with false positives disabling
the touchpad. evemu-record targeting the lid switch shows that what's happening
is that every so often a lid switch closed event is falsely recorded. When this
happens, moving your finger on the touchpad doesn't result in any cursor motion
(confirmed by evemu-record for the touchpad).

Worse, this false state persists across reboots, so when the lid switch is
recorded as closed, rebooting the machine (as you might expect a novice user to
do in a panic) doesn't reset the lid switch value or trigger a re-read, so the
problem does not go away.

Closing and then re-opening the lid to trigger a lid switch change (confirmed
with evemu-record targeting the lid switch) instantly makes the problem
disappear.

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