Touchpad triggers click events even with 'Tap to click' disabled (XPS 13)

[Peter Bittner]

In certain conditions the touchpad still seems to trigger a click event even though 'Tap to click' is disabled via System Settings > Mouse & Touchpad.

Seen on a 2015 Dell XPS 13 9343 Developer Edition running Ubuntu 14.04.3 LTS.

User Story
--------------
As a computer user, given I have disabled 'Tap to click',
I want the touchpad to fire a click event only when I hear a clicking noise when hard-pressing the touchpad anywhere
so that using the touchpad is a reliable and pleasant experience.

How to Reproduce
-------------------------
Summary:
- Use different applications to test the behaviour, e.g. on the menu bar.

Steps:
1. Open GIMP and move the mouse to the menu bar
2. Open the Edit menu in the menu bar and hover over it
3. Move to the File menu in the menu bar, hover over it
4. Try fiddling around carefully, also with two fingers, moving the cursor up and down
5. Soon or later an action event (mouse click?) is issued, and opens, e.g. File > Open ...

Comments:
- This behavior can reliably be reproduced in both the Archive Manager (3.10.2.1) and gedit (3.10.4) with two-finger touches on either of the toolbar (e.g. "New", "Open", "Add", "Extract", "Save", "Print", etc. button), the navigation bar (e.g. "Back", "Forward", "Up", "Home" button), the action buttons of the About box (Menu > Help > About, then "Credits", "CLose" button).
- This behavior can also be reproduced with, e.g., PyCharm (the JRE-powered JetBrain's IntelliJ IDE for Python), though less easily.

[Peter Bittner (peter-bittner)]

Other people on the Dell Community Website have reported this too, e.g. http://en.community.dell.com/techcenter/os-applications/f/4613/p/19649835/20825123#20825123

[Stefano Maffulli (smaffulli)]

http://askubuntu.com/questions/617117/in-ubuntu-15-04-simply-moving-the-mouse-via-touchpad-scrolls-the-window also here

[Peter Bittner (peter-bittner)]

Moved the irritating right-click behavior to a separate bug report: https://bugs.launchpad.net/dell-sputnik/+bug/1500762

[Shih-Yuan Lee (fourdollars)]

@Peter,

How does your touchpad work in the BIOS setup?
Are they smooth when you use the touchpad to make the cursor move circularly?

[Peter Bittner (peter-bittner)]

@fourdollars,

All mouse cursor movements are smooth in the BIOS setup. BIOS version is reported to be A05.

[Shih-Yuan Lee (fourdollars)]

@Peter,

Could you help to provide some logs by `apport-collect 1499989`?

[Peter Bittner (peter-bittner)]

@fourdollars, sure! I tried, but the application only says: "No additional information collected."

Not sure whether I used the program correctly. Have never used it before, and man page and --help are rather scarce.

[Peter Bittner (peter-bittner)]

Interestingly, I cannot reproduce the behavior with Archive Manager and Gedit as described in the "Comments:" above by myself. It may have been some of the system updates I installed or that I visited the BIOS, which changed the behavior. Strange.

[Shih-Yuan Lee (fourdollars)]

@Peter,

What is your BIOS version? You can find it by `sudo dmidecode -s bios-version`.

[Peter Bittner (peter-bittner)]

A05