Version 2.10.3 has been released (or at least, tagged) upstream, and fixes this regression. https://cgit.freedesktop.org/xorg/driver/xf86-input-evdev/log/
Some of our MyPaint downstream reporters have been testing, and the patch in question does indeed fix this regression. A patched third-party 2.10.2 deb is now available via the downstream bug report. https://github.com/mypaint/mypaint/issues/732 Please could 2.10.3 be uploaded to unstable as soon as possible? A lack of any positive, nonzero pressure when pressure is declared as an axis completely breaks the primary use for tablet hardware: painting programs. A wide variety of readily available, inexpensive hardware is affected by this bug. -- Andrew Chadwick