[Linuxwacom-discuss] Pressure sensitivity issues with recent xf86-input-wacom

[James P. <ja...@mo...>]

We've been testing new Intuos Pro2 (PTH-660) tablets on CentOS 6 - as 
CentOS/RHEL 6 doesn't have support for these, I've built 
input-wacom-0.35.0, libwacom-0.24 and xf86-input-wacom-0.34.2 - which 
allows the tablets to be recognised and used by the OS

However, in our testing with these tablets and older Intuos (4, 5, Pro) 
tablets, pressure sensitivity gives very 'odd' results with certain 3rd 
party applications - painting is only possible with minimal pressure - 
using 'normal' pressure, and nothing happens - or other unexpected 
results happen

Using the CentOS/RHEL 6 supplied 'xorg-x11-drv-wacom-0.32.0-1.el6' 
(xf86-input-wacom-0.32.0) and pressure sensitivity works as expected

The problem appears to be the change:

https://sourceforge.net/p/linuxwacom/xf86-input-wacom/ci/3e56ce4429d9053da3b873f8717b830e3bdc5ea4/

"Increase full-scale pressure range from 0..2047 to 0..65535"

Rebuilding from git before that commit and all is fine - building with 
that commit and we have the problem

It looks like these applications are expecting the pressure to be in the 
range 0..2047 - which mean they only work with minimal pressure - and 
anything over 2048 they can't cope with

Is this the fault of xf86-input-wacom - or the applications used?

As there appears to be no requirement to use the latest xf86-input-wacom 
with the PTH-660 tablets, our simple 'fix' is to carry on using the 
CentOS/RHEL 6 xorg-x11-drv-wacom RPM

Thanks

James Pearson