[Wayland-bugs] [Bug 89802] libinput incorrectly groups device behind same USB hub

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89802

            Bug ID: 89802
           Summary: libinput incorrectly groups device behind same USB hub
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: minor
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: killertofu at gmail.com

The logic that libinput uses to determine if two devices should be part of the
same group winds up grouping together anything behind the same USB hub. The
Cintiq 24HDT uses such a hub internally to provide seperate tablet and
touchscreen devices. It also, however, exposes one of the hub's ports
externally for the user to connect things to. If another input device is
connected to that port, it will be added to the same group as the Cintiq. This
can also be observed with /any/ USB hub, grouping all devices plugged into it.

This doesn't seem to cause any issues at the moment, but has been filed so it
isn't forgotten. I imagine that fixing it will likely first require having
libwacom or udev provide more information about related devices.

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