linux-kernel - Re: [PATCH 0/2] HID: multitouch: fix sticky-fingers quirks

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Message-ID: <41s6pp01-1947-n4pq-1866-820n84so4op1@xreary.bet>
Date: Wed, 15 Oct 2025 17:27:32 +0200 (CEST)
From: Jiri Kosina <jikos@...nel.org>
To: Benjamin Tissoires <bentiss@...nel.org>
cc: Shuah Khan <shuah@...nel.org>, Peter Hutterer <peter.hutterer@...-t.net>, 
    linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
    linux-kselftest@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 0/2] HID: multitouch: fix sticky-fingers quirks

On Wed, 8 Oct 2025, Benjamin Tissoires wrote:

> According to Peter, we've had for a very long time an issue on some
> mutltiouch touchpads where the fingers were stuck in a scrolling mode,
> or 3 fingers gesture mode. I was unable to debug it because it was
> rather hard to reproduce.
> 
> Recently, some people raised the issue again on libinput, and this time
> added a recording of the actual bug.
> 
> It turns out that the sticky finger quirk that was introduced back in
> 2017 was only checking the last report, and that those missing releases
> also happen when moving from 3 to 1 finger (only 1 is released instead
> of 2).
> 
> This solution seems to me to be the most sensible, because we could also
> add the NSMU quirk to win8 multitouch touchpads, but this would involve
> a lot more computations at each report for rather annoying corner cases.
> 
> Link: https://gitlab.freedesktop.org/libinput/libinput/-/issues/1194
> Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>
> ---
> Benjamin Tissoires (2):
>       HID: multitouch: fix sticky fingers
>       selftests/hid: add tests for missing release on the Dell Synaptics
> 
>  drivers/hid/hid-multitouch.c                       | 27 ++++++-----
>  .../testing/selftests/hid/tests/test_multitouch.py | 55 ++++++++++++++++++++++
>  2 files changed, 69 insertions(+), 13 deletions(-)

Now queued in for-6.18/upstream-fixes. Thanks,

-- 
Jiri Kosina
SUSE Labs