Created attachment 120646 [details] First two finger scroll while resting my thumb (not working), then two finger scroll while not resting my thumb (working) If i rest my thumb on the touchpad, two finger scrolling dose not work. Steps to Reproduce: 1. Rest thump on bottom part of touchpad 2. Move two fingers up and down on the middle to upper part of the touchpad Actual results: No vertical scrolling Expected results: Vertical scrolling 1.1.3-1.fc23 / Fedora 23 $ xinput list ⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ ELAN Touchscreen id=9 [slave pointer (2)] ⎜ ↳ SynPS/2 Synaptics TouchPad id=13 [slave pointer (2)] ⎣ Virtual core keyboard id=3 [master keyboard (2)] ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)] ↳ Power Button id=6 [slave keyboard (3)] ↳ Video Bus id=7 [slave keyboard (3)] ↳ Power Button id=8 [slave keyboard (3)] ↳ Lenovo EasyCamera id=10 [slave keyboard (3)] ↳ Ideapad extra buttons id=11 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=12 [slave keyboard (3)] $ xinput list-props 13 Device 'SynPS/2 Synaptics TouchPad': Device Enabled (136): 1 Coordinate Transformation Matrix (138): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000 libinput Tapping Enabled (277): 0 libinput Tapping Enabled Default (278): 0 libinput Tapping Drag Lock Enabled (279): 0 libinput Tapping Drag Lock Enabled Default (280): 0 libinput Accel Speed (281): 0.284483 libinput Accel Speed Default (282): 0.000000 libinput Natural Scrolling Enabled (283): 0 libinput Natural Scrolling Enabled Default (284): 0 libinput Send Events Modes Available (257): 1, 1 libinput Send Events Mode Enabled (258): 0, 0 libinput Send Events Mode Enabled Default (259): 0, 0 libinput Left Handed Enabled (285): 0 libinput Left Handed Enabled Default (286): 0 libinput Scroll Methods Available (287): 1, 1, 0 libinput Scroll Method Enabled (288): 1, 0, 0 libinput Scroll Method Enabled Default (289): 1, 0, 0 libinput Click Methods Available (290): 1, 1 libinput Click Method Enabled (291): 1, 0 libinput Click Method Enabled Default (292): 1, 0 libinput Disable While Typing Enabled (293): 1 libinput Disable While Typing Enabled Default (294): 1 Device Node (260): "/dev/input/event5" Device Product ID (261): 2, 7 libinput Drag Lock Buttons (295): <no items> libinput Horizonal Scroll Enabled (262): 1
This isn't something we can fix, sorry. The touchpad can only track two fingers at a time, once you put a third finger down we cannot track that position. This makes it hard to figure out where the fingers are and thus thumb/palm detection cannot work. IIRC we had some code to work around this but it was too unreliable, so we ripped it out and went for the simple and predictable "don't put a third finger down when two-finger scrolling" approach instead. On the positive side, some kernel changes we've been working on should make the touchpad capable of 5 touches, which then means we can fix this bug. You'll need to wait until those kernel changes are done though.
> On the positive side, some kernel changes we've been working on should make > the touchpad capable of 5 touches, which then means we can fix this bug. > You'll need to wait until those kernel changes are done though. Oki! Is it possible to track this work somehow? Tanks for working on this! Br Pär
I don't think there's a bugzilla for this, I think this here is the latest patchset: https://github.com/bentiss/linux/tree/synaptics-rmi4-smbus-v4.3-rc6+
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