https://bugs.kde.org/show_bug.cgi?id=375905

            Bug ID: 375905
           Summary: [HUION] Incorrect pressure information with Huion
                    WH1409
           Product: krita
           Version: 3.1.2
          Platform: Mac OS X Disk Images
                OS: OS X
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: tablet support
          Assignee: krita-bugs-n...@kde.org
          Reporter: renaudpi...@free.fr
  Target Milestone: ---

Created attachment 103778
  --> https://bugs.kde.org/attachment.cgi?id=103778&action=edit
Huion WH1409

The strokes are not made at the right pressure with a HUION WH1409 (see the
attached picture because it’s really hard to describe with words).

How to reproduce:
Select brush fill_circle (in my test: presets default, just changed the size
from 50 to 100px. Opacity is 100%).
make more or less vertical and horizontal lines by pressing slightly on the
pen: the pressure information seems to jump from high values to low values.

What's expected:
a line with a diameter varying smoothly.

Comments:
This one is really strange because it happens with only 1 of my 3 computers
(the Retina one, unfortunately my main computer). The tablet driver is exactly
the same on the 3 computers, as well as the Krita version. So if someone has an
idea...

More informations:
- The pressure curve on the brush is the one by default.
- The problem occurs whatever brush you choose (unless the size variation is
deactivated)
- Tested on a MacBook Air 2013 with Mac OS 10.12, the same graphics tablet with
the same version of Krita (3.1.2) and the same version of the tablet driver ->
all works perfectly.
- Same thing with an iMac 2009 (Mac OS 10.11, Krita has the same version number
as well as for the tablet driver): all works perfectly.
- The tablet works perfectly on the same computer with Photoshop CC 2017
- The tablet works perfectly on the same computer with the application to test
the tablet provided by Huion.

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