[Wayland-bugs] [Bug 98844] Delay on touchpad mouse input with tapping enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98844

            Bug ID: 98844
           Summary: Delay on touchpad mouse input with tapping enabled
           Product: Wayland
           Version: 1.5.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: main.haarp at gmail.com

Hello,

I'm using libinput 1.5.0 on X11. My Synaptics touchpad works, but experiences a
noticeable delay on cursor movement when tapping is enabled. This is
reminiscient of #89206, which is marked as fixed.

This delay makes fine cursor movement very difficult for me. The synaptics
driver which I've been using before does not exhibit this behavior. I wonder if
it uses different algorithms or just uses more aggressive thresholds.

Decreasing DEFAULT_TAP_MOVE_THRESHOLD TP_MM_TO_DPI_NORMALIZED fixed this issue
for me. I found that I need to lower it to at least 0.5 for the delay to become
unnoticeable. 1 was not enough.

Are there any objections to making this the default? I doubt I'm the only one
who experiences it. Or maybe it could be exposed as a property?

Thanks!

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