[Wayland-bugs] [Bug 100021] Set "Tapping Enabled" by default for "Logitech Rechargeable Touchpad T650"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100021

--- Comment #5 from Peter Wu <peter at lekensteyn.nl> ---
(In reply to Peter Hutterer from comment #4)
> (In reply to Peter Wu from comment #3)
> > The T650 is not like a laptop clickpad, the buttons are not visible. See
> > http://support.logitech.com/en_us/product/touchpad-t650
> > https://ic.tweakimg.net/ext/i/1349867977.jpeg
> > (it looks more like the Apple Trackpad which also has no buttons)
> 
> yep, I know, I have one in front of me and did some of the hid++ development
> on it.

So did I (have the device and done HID++) and am reporting this bug on behalf
of a user who was asking me why it did not work after a kernel update.

> > There is no situation where someone with this device does not want the
> > tap-to-click functionality. 
> 
> You've asked every user of the T650 out there? Please don't make generic
> statements unless you have data to back it up. Your use-case does not
> necessarily match the use-case of everyone else.

I have not performed a full survey but can give you links to various complaints
on distro forums, a large thread on the Logitech support forums and more.
(Search for "Logitech 3.19 T650" or "Linux T650 tapping")

https://www.reddit.com/r/Ubuntu/comments/1ys970/logitech_t650
https://bbs.archlinux.org/viewtopic.php?id=200223
https://askubuntu.com/questions/270325/logitech-touchpad-t650-does-not-click
https://bugzilla.redhat.com/show_bug.cgi?id=1208170
https://community.logitech.com/s/question/0D531000050zSXLCA2/

If Google is a guide, the top suggestions after "Logitech T650 tap" is "to
click", "not working", "and drag".

> > While higher layers can try to fix the bad
> > decision made by the lower library, I believe it is the low-level library
> > task to provide a sane default while higher-level users must only have to
> > change this in exceptional cases.
> 
> look, we made the decision to disable tapping unless it's required. Implying
> that this is insane doesn't get you brownie points with the developers who
> are working on this. This is a low-level library that is never exposed to
> the user directly, there is always at least one layer in between that can
> change any defaults at will. I believe KDE does so already for tapping, but
> I might be wrong on that.

Well, I appreciate the efforts that you put in it, but based on received
reports, I think that enabling tap by default is something that better serves
users. (Personally I only connected the T650 today to test the issue reported
by a user.)

AFAIK KDE only has a "Mouse Click Emulation" option which, when enabled, would
change the laptop touchpad behavior (it did not change the T650 setting when
plugged in). If libinput already has a hwdb where the default can be set, why
should every application duplicate the detection of this device?

What are the drawbacks of doing this in libinput? While searching I found only
one report that is not strictly related to disabling tapping, but a bad
pressure threshold:
https://askubuntu.com/questions/796546/logitech-touchpad-t650-problem-working-fine-on-ubuntu-14-10-but-not-on-any-oth

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