[PATCH] HID: multitouch: add MT_QUIRK_STICKY_FINGERS to MT_CLS_VTL

[PATCH] HID: multitouch: add MT_QUIRK_STICKY_FINGERS to MT_CLS_VTL

[DaytonCL]

Hi Benjamin,

Thank you very much for your help on the libinput GitLab issue tracker [1].
Your suggestion to apply MT_QUIRK_STICKY_FINGERS to the VTL class was exactly
what was needed.

This patch fixes the intermittent stuck two-finger scrolling and false
right-clicks that occur on some VTL-class touchpads, specifically my
TOPS0102:00 35CC:0104 device.
The fix has been tested thoroughly on my laptop and works perfectly.
[1] https://gitlab.freedesktop.org/libinput/libinput/-/issues/1225
Best regards,
Artem

[PATCH] HID: multitouch: add MT_QUIRK_STICKY_FINGERS to MT_CLS_VTL

[DaytonCL]

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@redhat.com>
Tested-by: DaytonCL <artem749507@gmail.com>
Signed-off-by: DaytonCL <artem749507@gmail.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

Re: [PATCH] HID: multitouch: add MT_QUIRK_STICKY_FINGERS to MT_CLS_VTL

[Benjamin Tissoires]

On Sun, 14 Dec 2025 14:34:36 +0100, DaytonCL wrote:
> 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.
> 
> [...]

Applied to hid/hid.git (for-6.19/upstream-fixes), thanks!

[1/1] HID: multitouch: add MT_QUIRK_STICKY_FINGERS to MT_CLS_VTL
      https://git.kernel.org/hid/hid/c/ff3f234ff1dc

Cheers,
-- 
Benjamin Tissoires <bentiss@kernel.org>