[Wayland-bugs] [Bug 104734] Unreliable two-finger scrolling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104734

            Bug ID: 104734
           Summary: Unreliable two-finger scrolling
           Product: Wayland
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: freedesktop at dosowisko.net

One of the main issues that drive me away from any libinput-based session
towards xf86-driver-synaptics is the way two-finger scrolling is triggered -
or, actually, sometimes not triggered - with libinput (with either
xf86-driver-libinput, libinput debug tools or various Wayland compositors).

The situation: The pointer is already moving with one finger and the second
finger is placed on the touchpad.
Expected result: pointer stops to move and content starts to scroll.
Result got: pointer continues to move, no scrolling happens.

xf86-driver-synaptics detects all the two-finger scrolls reliably and works as
expected. With libinput, I always need to stop moving and only then can start
scrolling, which is extremely annoying.

dos at yoga:~$ pacman -Ss libinput
extra/libinput 1.9.4-1 [installed]

Laptop: Lenovo Yoga 900-13ISK

# DMI:
dmi:bvnLENOVO:bvrC6CN39WW:bd10/11/2016:svnLENOVO:pn80MK:pvrLenovoYOGA900-13ISK:rvnLENOVO:rnVIUU4:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoYOGA900-13ISK:

# Input device name: "Synaptics TM3066-002"
# Input device ID: bus 0x18 vendor 0x6cb product 0x77c6 version 0x100
# Size in mm: 87x57

The attached recording shows the example misinterpreted touchpad action.
libinput-debug-events.txt shows the libinput's misinterpretation. However, when
the recording is replayed with evemu-play, it's actually interpreted correctly
(as seen in libinput-debug-events-replayed.txt).

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