Hello,
I have a Starlabs Mark IV and since June this year, my touchpad has lost all right-click functionality(no context menu) and I can no longer drag windows I Have recently found there is a known issue with libinput, and it has recently been fixed upstream. Starlabs released a fix yesterday but it has not been able to resolve the problem.
The issue occurs when I upgrade from kernel 5.11 to 5.12(Kubuntu 21.04 to 21.10). I also experienced the same problem when I was on Manjaro(KDE and Gnome).
When I run libinput list-devices | grep Touchpad command I notice the output changes when I upgrade.
On 21.04 when my system is working I get the output - kernel bug: clickpad advertising right button
However on 21.10 when it breaks the output is - kernel bug:clickpad with a right button, assuming it is not a clickpad.

Has anyone else had any similar issues?, and if so have any idea how it can be resolved.
I am running version 1.18.1 libinput, would up/downgrading libinput either likely to fix the issue or break my system?
Any help or suggestions would be greatly appreciated.

Cheers

a laptop brand/model built for Linux.

So how did you install the fix, and where and what exactly is it? A new version of libinput with a bugfix? A fixed kernel module? Something else? Where?

It sounds to me like you should be fine with any *buntu LTS release.

Best to show us that output.
Preferably without grepping, if it isn't too long.

I installed the fix via Starlabs ppa (https://support.starlabs.systems/kb/...r-drag-windows). This was a vendor quirk file installed into usr/share/libinput.
Output for 21.04
steve@steve-LabTop:~$ sudo libinput list-devices | grep Touchpad
[sudo] password for steve:
event7 - PCT1336:00 093A:1336 Touchpad: kernel bug: clickpad advertising right button
Device: PCT1336:00 093A:1336 Touchpad
Output for 21.10
steve@steve-LabTop:~$ sudo libinput list-devices | grep Touchpad
[sudo] password for steve:
event10 - PCT1336:00 093A:1336 Touchpad: kernel bug: clickpad with right button, assuming it is not a clickpad
Device: PCT1336:00 093A:1336 Touchpad

Show us the device list without grepping, if it isn't too long.

Also:

Starlabs fix has now fixed the issue

On all your affected machines/distros simultaneously? How?
Please share your solution, others will benefit.

Starlabs have altered their fix I assume.
This fix was for Debian based distros, however, for non Debian distros there is a separate fix.
If anyone has similar issues, please visit https://support.starlabs.systems/kb/...r-drag-windows to resolve issue