double tap on touchpad isn't recognized as double click on ubuntu 18.04 bionic

[beta-tester]

i have a Logitech K400 wireless keyboard-touchpad-combo.
https://secure.logitech.com/assets/46733/19/wireless-touch-keyboard-k400r.jpg
ID 046d:c52b Logitech, Inc. Unifying Receiver

up to ubuntu 17.10.1, i hadn't any issues with it using ubuntu.
since ubuntu 18.04 (daily-build / beta2) when do a double tap to the touchpad, it will always be recognized as single click only.

i tried to use ubuntu 18.04 on my notebook and used the notebook's touchpad there.
there, ubuntu 18.04 is recognizing a double tap as double click, when using the notebook's touchpad.
if i connect the Logitek K400 keyboard-touchpad-combo to the notebook and use the K400's touchpad, a double tap is still recognized as single click only.

i tried to change touchpad settings in the ubuntu's settings panel without getting double tap working.
then i installed gnome-tweak-tools and changes touchpad settings in the gnome-tweaks settings panel. aslo without getting double tap recognized as double click.

[beta-tester (alpha-beta-release)]

attached lsusb output of that Logitech K400 wireless keyboard-touchpad combo.

[Daniel van Vugt (vanvugt)]

Please report the bug to the libinput developers here:

  https://bugs.freedesktop.org/enter_bug.cgi?product=wayland&component=libinput

When done, please let us know the ID of the new bug.

[beta-tester (alpha-beta-release)]

here the link
https://bugs.freedesktop.org/show_bug.cgi?id=105974

[beta-tester (alpha-beta-release)]

watching the content of the evemu-record, the only different between double-tap on the touchpad and double-click on the mouse buttons below the touchpad i saw, is the timing.

double-tap is way faster than the double-click.

double-tap: 6ms..11ms between tap-release
vs.
double-click: 79ms..137ms between click-release

going back to ubuntu 18.04 daily-live is made sligktly slower double-tap on the touchpad with the result, that some of the slower double-taps were recognized as double-click.

is there somewhere a kind of "debouncing"-algorithm that let the double-tap recognized as "bouncing" and is filtered out - so it is only seen as single-click... ?

[beta-tester (alpha-beta-release)]

PS.: confirmed as debouncing bug in libinput.
https://bugs.freedesktop.org/show_bug.cgi?id=105974#c5

[beta-tester (alpha-beta-release)]

libinput10 1.10.5 does have that fix.

seems to be fixed in cosmic ubuntu 18.10 daily since 2018-05-06.
(double tap is working as expected)

but bionic ubuntu 18.04 LTS release still uses libinput10 (1.10.4)
(got no upgrade to 1.10.5 yet)

[Daniel van Vugt (vanvugt)]

That's correct.

We can, in theory, consider upgrading libinput in 18.04 so long as it's to a bug fix release only. Not a feature release. So yeah we could consider 1.10.5/6 for bionic.

Longer term however it will be interesting to see how we handle bug fixes to bionic's libinput. Especially after the 1.10 series stops getting point releases.

[Errol Atterbury (errolbury)]

quote from #6
    "libinput10 1.10.5 does have that fix."

The (kubuntu) cosmic-desktop-amd64.iso of 2018-05-26 contains libinput10_1.10.7-1
However... my K400+ still does not perform a classic double-click

[Daniel van Vugt (vanvugt)]

Fix released in Ubuntu 18.10 cosmic. And Ubuntu 18.04 has been nominated to receive the fix.

[Errol Atterbury (errolbury)]

Looking at https://bugs.freedesktop.org/show_bug.cgi?id=105974#c5
I see the problem...
the K400 Plus tag--i.e. LIBINPUT_MODEL_LOGITECH_K400+--has not been added to libinput-model-quirks.hwdb
Next?

[Daniel van Vugt (vanvugt)]

Errol, if you feel the fix doesn't work then please comment in:
https://bugs.freedesktop.org/show_bug.cgi?id=105974

[beta-tester (alpha-beta-release)]

i guess
Logitek K400 and
Logitec K400+ have different device ids
so the fix is only for my Logitek K400 and does not fix the issue for a Logitek K400+.

[Daniel van Vugt (vanvugt)]

Good point.

Errol, please report a new bug for the K400+ here:
 https://bugs.freedesktop.org/enter_bug.cgi?product=wayland&component=libinput

[Errol Atterbury (errolbury)]

Done
https://bugs.freedesktop.org/show_bug.cgi?id=106720

[beta-tester (alpha-beta-release)]

my Logitech K400 still does not react to double tap on ubuntu 18.04.1

so ubuntu 18.04.1 still got no update of libinput to version >=1.10.5

[Errol Atterbury (errolbury)]

from https://bugs.freedesktop.org/show_bug.cgi?id=106720#c9

"And unless Ubuntu starts shipping git master, there will be bugs that are fixed here but still broken in Ubuntu."

[Daniel van Vugt (vanvugt)]

Yes, this bug is marked as fixed in Ubuntu 18.10 only. You can tell the fix is missing from 18.04 partly by the "Nominated for Bionic" message at the top.

To get the same fix in Ubuntu 18.04 it's probably helpful to watch bug 1767559.

[Mike Bandfield (mikeband)]

Try triple-clicking instead of double-clicking. Don't ask how I found this work around but may help others trying to live through this irritating bug.

[Sebastian (smartin-ubuntu-one)]

This fix is still not available in the 18.04 LTS version. I always thought that LTS was long time support.

[Daniel van Vugt (vanvugt)]

Upstream says the fix is in libinput versions 1.10.8 and/or 1.11, so not in Ubuntu 18.04 yet.

You might be able to download a newer version that's already in Ubuntu 18.10/19.04 here:

  https://launchpad.net/ubuntu/+source/libinput

and install that to get the fix.

[Jörg (joerg-niemoeller)]

Hi,

I experience this issue now with an Logitech K830 and Ubuntu 20.04
Double tap is treated like a single tap. Triple tap works as double.
Double click on the dedicated left mouse button works without issues. Just double tap on the trackpad does not.
I checked this with two different machines running Ubuntu 20.04. Same on both.

The strange thing is that the same K830 that behaves this way in Ubuntu has no issues with double tap in windows 10. So i guess that means it is not an issue with the Keyboard hardware.

The other strange thing is that I have three K830 and only one of them is showing this behavior. The other two work well in Ubuntu and have double tap without issues.

I write this here, because the symptoms in Ubuntu are the same as described by the original poster although the keyboard model is different.

[Daniel van Vugt (vanvugt)]

This bug is closed. If you still experience problems then please open a new bug by running:

  ubuntu-bug libinput10