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[Christopher Small <786317@xxxxxxxxxxxxxxxxxx>]

I did some more research and realized a few things.

Something I've failed to mention till now - I'm running 11.10 AND Gimp
GIMP 2.7.3 (a current snapshot of development towards 2.8). Although
there were definitely still issues (at least as I recall) with this
version of gimp before the Ubuntu upgrade, after playing around with
nearly all of the UIs on my computer, this combo seems to make things a
lot better, at least usable, even in 3D Unity.

I ran through Gnome Classic (with effects, though there weren't really
any actually enabled, so the test coverage could be improved upon here),
Unity 2D, Unity and Gnome Shell. Of these, I was only able to produce
issues with Unity 3D. And as I've discovered, even that seems to be much
better now; at least usable.

I opened a blank canvas and did rapid bunches of four strokes at a time
so that it would be easy to count misses. I had zero problems with any
configuration except for Unity 3D. I did 36 bunches, and only had a
total of 18 missed strokes. What is interesting is that once I hid the
toolbox (by pressing Tab - not sure if this functionality was present in
Gimp 2.6) the misses went down to 0 out of 60 bunches. Running my
wacomsettings script (with xsetwacom calls - see an earlier post of
mine) didn't seem to have any negative effect here. Once I brought the
toolbox back to the front, I experienced only one or two misses (out of
sixty bunches, if you can believe it). Not sure why the behavior didn't
come back as strongly, but it didn't. This is already a significant
improvement from the sticking-every-other-time behavior I was seeing a
while back. And I actually really like being able to hide the Toolbox
while I'm drawing (except when I have another screen I can let it sit
on), so that to me is a good workaround. And as I said, even with the
toolbox up, the bad behavior seems far less frequent now. So, I
definitely recommend everyone try out Gimp 2.7 to see what change in
behavior you get from it.

I think that my results definitely further support the hypothesis that
the Toolbox and window stacking is somehow part of the problem here.

A few more notes about my setup for the sake of thoroughness. I'm using
an Intuos 4 and the new Wacom Graphics Tablet GUI within System Settings
to set the Tracking mode to relative (which I kind of like, since it
doesn't skew the tablet strokes when I'm using multiple screens). I
played around with that a bit while testing out Classic Gnome, but it
didn't change anything. I should have tried it in Unity to see if that
made things better or worse (since that is the one component that was
actually having any issues for me). That is an area that could stand
more testing. If I get the time to, I'll definitely share my findings.
It might also be worth testing out the effects of changing parameters on
the mapping matrix a bit. I had angle mapped to tilt, color mapped to
pressure, and hardness to force. I had size mapped to velocity at one
point, and it seemed that I was getting a slightly higher rate of issues
there, but that was before embarking on my "bunches" testing (without
which, it's really hard to get a good sense for how bad things actually
are).

I'll also point out that whereas (as I mention in my earlier post) I did
experience some problems just after running my wacomsettings script in
Gnome Shell, I didn't this time around. That might have been a fluke.
I'll definitely keep an eye on that. At this point I intend to mostly
use Gnome Shell, even though it's a bit buggy still.

On a final note, I didn't see any of the problems which Andrew has
described, but obviously there are a lot of parameters to tweak between
our two setups where one might find issues.

Cheers

Chris

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https://bugs.launchpad.net/bugs/786317

Title:
  wacom intuous3 often fails to draw stroke (release click not
  recognised?)

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