Bug 94986

Summary:	ETPS/2 Elantech Touchpad imprecise pointer movement using libinput
Product:	Wayland	Reporter:	jiteshsingh <jiteshsingh17>
Component:	libinput	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	bugseforuns, peter.hutterer
Version:	unspecified
Hardware:	All
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	98535
Attachments:	evemu-describe output

Description jiteshsingh 2016-04-18 07:01:40 UTC

I have Asus K55VM-SX086D laptop. The touchpad is ETPS/2 Elantech Touchpad. Pointer movement was very fine when synaptics driver was in use. After switching to libinput, I no more feel the same accuracy and control as it used to be. I am not able to precisely point objects, I either overshoot or undershoot them. I have already tried adjusting accel speed via xinput, hysteresis patch, this patch: https://bugzilla.redhat.com/show_bug.cgi?id=1316655, but no success. Following are the details:

$ xinput --list-props 13
Device 'ETPS/2 Elantech Touchpad':
    Device Enabled (138):    1
    Coordinate Transformation Matrix (140):    1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
    libinput Tapping Enabled (274):    1
    libinput Tapping Enabled Default (275):    0
    libinput Tapping Drag Enabled (276):    1
    libinput Tapping Drag Enabled Default (277):    1
    libinput Tapping Drag Lock Enabled (278):    0
    libinput Tapping Drag Lock Enabled Default (279):    0
    libinput Accel Speed (280):    0.000000
    libinput Accel Speed Default (281):    0.000000
    libinput Natural Scrolling Enabled (282):    1
    libinput Natural Scrolling Enabled Default (283):    0
    libinput Send Events Modes Available (258):    1, 1
    libinput Send Events Mode Enabled (259):    0, 0
    libinput Send Events Mode Enabled Default (260):    0, 0
    libinput Left Handed Enabled (284):    0
    libinput Left Handed Enabled Default (285):    0
    libinput Scroll Methods Available (286):    1, 1, 0
    libinput Scroll Method Enabled (287):    1, 0, 0
    libinput Scroll Method Enabled Default (288):    1, 0, 0
    libinput Click Methods Available (289):    1, 1
    libinput Click Method Enabled (290):    1, 0
    libinput Click Method Enabled Default (291):    1, 0
    libinput Disable While Typing Enabled (292):    1
    libinput Disable While Typing Enabled Default (293):    1
    Device Node (261):    "/dev/input/event5"
    Device Product ID (262):    2, 14
    libinput Drag Lock Buttons (294):    <no items>
    libinput Horizonal Scroll Enabled (263):    1

Comment 1 Peter Hutterer 2016-04-22 04:40:38 UTC

Attach the output from evemu-describe for your touchpad please, thanks.

Comment 2 jiteshsingh 2016-04-22 07:08:49 UTC

It seems the problem has been fixed already. Either I have got used to the new behaviour or any recent update might have fixed it. Thankyou.

Comment 3 Peter Hutterer 2016-04-26 05:23:02 UTC

alright, thanks. I'll close this bug now, please re-open if it happens again.

Comment 4 jiteshsingh 2017-03-30 17:16:40 UTC

Created attachment 130587 [details]
evemu-describe output

Comment 5 jiteshsingh 2017-03-30 17:20:42 UTC

Hi Peter,

I have been waiting for it to get fixed in libinput updates. But unfortunately, the problem still exists with no improvement. I have attached evemu-describe output.

Thanks.

Comment 6 Daniel van Vugt 2018-01-10 08:14:11 UTC

Sounds like a duplicate of bug 98839. The fix for that bug resolves imprecise pointer movement on every touchpad I had tested. It is due for release in libinput 1.10.0

Comment 7 Daniel van Vugt 2018-01-10 08:15:42 UTC

Maybe see how the fix for bug 101139 goes too.

Comment 8 Peter Hutterer 2018-04-20 05:54:28 UTC

Closing, libinput 1.8 or so had new touchpad accel code, this bug is now a year old. The current bug to complain about touchpad acceleration is Bug 101139, or as Daniel mentioned, Bug 98839 may have fixed this too.

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