[Wayland-bugs] [Bug 91135] Two-finger scrolling jumpy with Synaptics touchpad

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91135

Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |benjamin.tissoires at gmail.co
                   |                            |m

--- Comment #14 from Peter Hutterer <peter.hutterer at who-t.net> ---
This event here is the problem:

E: 1.469012 0003 0035 4220      # EV_ABS / ABS_MT_POSITION_X    4220
E: 1.469012 0003 0036 1777      # EV_ABS / ABS_MT_POSITION_Y    1777
E: 1.469012 0003 002f 0001      # EV_ABS / ABS_MT_SLOT          1
E: 1.469012 0003 0039 -001      # EV_ABS / ABS_MT_TRACKING_ID   -1
E: 1.469012 0003 0000 4220      # EV_ABS / ABS_X                4220
E: 1.469012 0003 0001 1777      # EV_ABS / ABS_Y                1777
E: 1.469012 0003 001c 0004      # EV_ABS / ABS_TOOL_WIDTH       4
E: 1.469012 0001 0145 0001      # EV_KEY / BTN_TOOL_FINGER      1
E: 1.469012 0001 014d 0000      # EV_KEY / BTN_TOOL_DOUBLETAP   0
E: 1.469012 0000 0000 0000      # ------------ SYN_REPORT (0) ---------- +25ms

before this, slot 0 is on 3481/2721, slot 1 is on 4224/1777. In the event where
the slot 1 ends slot 0 jumps to slot 1 positions *for a single event*. In the
next event it is back to 3478/2702, i.e. the previous slot 0 position.

Benjamin, is this something we can detect in the kernel or do I need to work
around it? This is a semi-mt buttonpad.

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