Actually, I just restarted that laptop and played around a bit more. I
have it nailed to a very simple scaling issue and reproducible at this
stage. So probably an easy ting to fix somewhere. Let me see if I can
explain it.
On Linux Mint 17.3 Cinnamon Edition, I can configure the displays in a
Display widget that shows the two monitors and I can drag them around to
model their physical relationship. Much like in MS-Windows, and quite
awesomely slick really.
Now I have experimented with my table configured to left, right, above
and below, and performed pen motion tests across the screen and here is
what is clear:
Imagine the edge that the two monitors logically join at, and call it E.
Let us define the axial direction as that orthogonal to (perpendicular
to E) conceptually the line I'd move the pen along if I went from the
outside edge of one monitor to the outside edge of the other crossing E.
Now:
If I move the pen across the table perpendicular to the axial direction
(parallel with E) the cursor tracks the pen nib well.
If I move the pen along the axial direction then, at the far edge of the
tablet the cursor is under the nib and as I move towards the other
monitor the cursor runs ahead of the pen nib, increasingly such that by
the time I reach the opposite edge of the tabled, edge E, the cursor is
now at the far edge of the monitor.
A further test reveals that if I mirror rather than extend the displays,
the problem goes away, the cursor tracks under the pen nib fine.
My conclusion:
There is a mapping somewhere that is erroneously reading the pen
coordinate in the tablet space and moving the cursor in a larger X
windows space.
I wonder if that is easy to fix? I wonder also if this is specific to
the Huion GT-190 or if it's generically an issue with Digimend and Linux
MINT or Ubuntu on which its based or Xorg or?
Regards,
Bernd.
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