Bug 103996

Summary:	kernel: Elantech touchpad erroneously detects three fingers
Product:	Wayland	Reporter:	Nobody <francescoboc>
Component:	libinput	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED WONTFIX	QA Contact:
Severity:	normal
Priority:	medium	CC:	benjamin.tissoires, peter.hutterer
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	evemu record for a not-detected two finger tap other undetected two finger tap and another dmesg output

Description Nobody 2017-11-30 10:43:09 UTC

I am having problems with my Touchpad Elantech on Acer Aspire E1-572G. I tried both Ubuntu 16 and 17 (and also other Linux distros), but no luck. My problem is that the gestures (two-finger tap for right click and two-finger scroll) are actually working, but not in a smooth way. For example, on average, I have to do the two-finger tap 2 or 3 times before I get it right, and I have to be VERY careful to hit the pad with the two fingers exactly in the same time, other wise it doesn't work. It's annoying and it slows me down a lot.

I just switched from Windows 10 and over there the touchpad gestures were a LOT smoother, never had to do them more than one time. I'm wondering if there's any possibility to use the Windows drivers on Ubuntu, or any other workaround.

Here's a video comparison of my Elantech touchpad on Windows 10 and on Ubuntu 17.10, to clearify what my problem is: https://youtu.be/L6SBWJpAT5A

Scrolling is laggy and it doesn't always work, positioning the pointer for small movements is difficult, and the two-finger tap for right click is almost unusable.

Thank you for your help.

Comment 1 Peter Hutterer 2017-11-30 22:46:38 UTC

Please attach an evemu-record from a two-finger tap sequence that didn't get detected.

Comment 2 Nobody 2017-12-02 14:06:34 UTC

Created attachment 135879 [details]
evemu record for a not-detected two finger tap

here it is!
thank you

Comment 3 Peter Hutterer 2017-12-03 23:13:25 UTC

was that really a two-finger tap? The reason I'm asking is:

E: 0.000001 0001 014e 0001	# EV_KEY / BTN_TOOL_TRIPLETAP   1

This line indicates that the device thought there were 3 fingers down on the touchpad, that would then trigger a middle click in the default confing. If this was really a two-finger tap, then we have a problem with the touchpad firmware and the kernel drivers.

Comment 4 Nobody 2017-12-04 18:18:49 UTC

Created attachment 135935 [details]
other undetected two finger tap

other undetected two finger tap

Comment 5 Nobody 2017-12-04 18:19:29 UTC

Created attachment 135936 [details]
and another

and another

Comment 6 Nobody 2017-12-04 18:20:16 UTC

yes, it was.
to make sure, i recorded other two undetected two-finger taps. I'm attaching the logs to this comment. they both show:
# EV_KEY / BTN_TOOL_TRIPLETAP   1
but i never touched they trackpad with three fingers!

Comment 7 Peter Hutterer 2017-12-08 00:57:31 UTC

CC-ing Benjamin, this is a kernel bug/firmware issue if the touchpad detects three fingers when there are none. Please attach a dmesg, thanks.

Comment 8 Nobody 2017-12-09 11:39:24 UTC

Yes, ok. I'm attaching the dmesg output. I hope I did it correctly.
Thank you for your time.

Comment 9 Nobody 2017-12-09 11:39:47 UTC

Created attachment 136055 [details]
dmesg output

Comment 10 Nobody 2018-01-02 13:37:04 UTC

You know what? I'm sick of this bull***t. I wasted enough time trying to fix stupid linux problems. I'm going back to a cracked Windows 10 and that's it.

Comment 11 Peter Hutterer 2018-01-10 00:48:40 UTC

no point keeping the bug open then

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