Comment 45 for bug 1697122

(In reply to Denilson Figueiredo de Sá from comment #29)
> [This comment on the duplicate bug](https://bugzilla.mozilla.org/show_bug.cgi?id=1606832#c33) says:
>
> > correct pressure readings and pointerType (pen), but pointer ID is 0 (same as mouse) and there's no tilt input.
>
> That's something worth checking/testing before marking this bug as fixed.
>
> ---
>
> Also, bug 1822714 claims the tilt value has the incorrect sign (direction) on Mac. Still worth checking if that's relevant on Linux/GTK. Unfortunately, pens/tablets with tilt support are less common and more expensive. I believe any Wacom Intuos, Wacom Intuos Pro, or Wacom Cintiq should have pressure and tilt. There are also other brands, and many of them might require special drivers (such as [this one](https://opentabletdriver.net/Tablets)), while Wacom drivers are readily available and pre-installed on any Linux+libinput system.

Bug 1501744 introduces pen support on Linux. pointer ID is 1 so it's reported as pen. We can do further fixes when Bug 1501744 lands.