linux-kernel - [PATCH] HID: multitouch: add MT_QUIRK_STICKY_FINGERS to MT_CLS

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Message-ID: <20251214133648.307106-2-artem749507@gmail.com>
Date: Sun, 14 Dec 2025 14:34:36 +0100
From: DaytonCL <artem749507@...il.com>
To: benjamin.tissoires@...hat.com
Cc: jikos@...nel.org,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] HID: multitouch: add MT_QUIRK_STICKY_FINGERS to MT_CLS_VTL

Some VTL-class touchpads (e.g. TOPS0102:00 35CC:0104) intermittently
fail to release a finger contact. A previous slot remains logically
active, accompanied by stale BTN_TOOL_DOUBLETAP state, causing
gestures to stay latched and resulting in stuck two-finger
scrolling and false right-clicks.

Apply MT_QUIRK_STICKY_FINGERS to handle the unreleased contact correctly.

Link: https://gitlab.freedesktop.org/libinput/libinput/-/issues/1225
Suggested-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Tested-by: DaytonCL <artem749507@...il.com>
Signed-off-by: DaytonCL <artem749507@...il.com>
---
 drivers/hid/hid-multitouch.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 179dc316b..a0c1ad5ac 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -393,6 +393,7 @@ static const struct mt_class mt_classes[] = {
 	{ .name = MT_CLS_VTL,
 		.quirks = MT_QUIRK_ALWAYS_VALID |
 			MT_QUIRK_CONTACT_CNT_ACCURATE |
+			MT_QUIRK_STICKY_FINGERS |
 			MT_QUIRK_FORCE_GET_FEATURE,
 	},
 	{ .name = MT_CLS_GOOGLE,
-- 
2.52.0