In D24532#545981, @mwolff wrote:

thanks, do you have commit rights to KDE?

This is a follow up of D24491.

1. Controls not disabled
2. "Two-finger-tap" radio buttons are missing their labels
3. Middle-click label missing its radio buttons
   
   And then of course, unrelated to this patch or bug, is https://bugs.kde.org/show_bug.cgi?id=407464

In D21884#481568, @romangg wrote:

Ok, that would be even better. Only drawback is then that it shows the "wrong" interface in case libinput is used until a touchpad is plugged, but that's such an uncommon case that I don't think we should invest much more time into it. On the other side since libinput is the default backend in the future it might make more sense to show the libinput one per default if no touchpad is plugged in. Would this also be possible or is the current X libinput backend missing this funcitonality? At least from user perspective it could be confusing to see the non-default backend on the workstation without touchpad and something completely different on his laptop.

Roman, with this patch the box with 'No touchpad found' is shown under X11, too:

Here's my modified file.

I'm on Arch Linux and '/usr/bin/python' is version 3.7.3. I don't know how the python version is determined in scripts run through 'perf script', unfortunately. Could be that they invoke /usr/bin/python (through #!/usr/bin/python?).

I'm not a KDE developer so feel free to ignore my comments, but there are two issues for python 3:

Added link to bug 383889.

I opened https://phabricator.kde.org/D7621 which includes the requested changes.