[Bug 276709] hms(4): two finger scroll stops half way unless dev.hms.0.drift_thresh=0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276709

--- Comment #4 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=c0a5ee953f41905038aadba7b7d0df2af6612e71

commit c0a5ee953f41905038aadba7b7d0df2af6612e71
Author:     Edward Tomasz Napierala <trasz@FreeBSD.org>
AuthorDate: 2024-11-25 15:08:10 +0000
Commit:     Edward Tomasz Napierala <trasz@FreeBSD.org>
CommitDate: 2024-11-26 10:28:51 +0000

    hms(4): improve scroll with IICHID_SAMPLING

    The current quirk is designed to discard duplicated data read from
    the chip.  Problem is, it also discards real events when they happen
    to be identical, which is the case with scroll wheel events;
    differently from X/Y they always move by fixed offset.  This results
    in two-finger scroll that would stop mid-way that could be fixed by
    manually setting dev.hms.0.drift_thresh to 0.

    To fix that, don't discard duplicates when there's wheel movement.
    For users with actual duplicates problem this will result in scroll
    suddenly becoming quite inertial, but it will stop moving at any touch,
    so shouldn't be terrible.

    PR:             kern/276709
    Reviewed By:    wulf
    Differential Revision:  https://reviews.freebsd.org/D47640

 sys/dev/hid/hms.c | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

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