desktop-packages team mailing list archive

[Douglas Griffin <863154@xxxxxxxxxxxxxxxxxx>]

Confirmed Diggao's post #11.

Line streaking/spiking was produced in GIMP 2.6 using only a standard
generic Microsoft Optical Mouse (USB-PS/2 Compatible) and Ubuntu 11.10.
Nothing like this seen in other programs such as MyPaint, SynfigStudio,
Inkscape or Blender.

In fact, the streaking frequency was far more prevalent, 5 to 10 times
greater, with the mouse than the Genius Mousepad 8x6 Tablet on our 64bit
Ubuntu setup.

Did the same thing with a Dell ball-tracking mouse with PS/2 connection
on our 32bit Ubuntu setup.

I can't help but think that maybe someone made some little tweak in
communication protocol and loused up the connection handshaking from
what was previously agreed upon. Or maybe another few clock cycles were
added in some other process that causes a loss of communication which
must be then reestablished. Maybe the line streaks in GIMP 2.6 are the
same thing as the dropouts you get the faster you draw in GIMP 2.7.3.
Perhaps they are the same problem manifest differently. The problem is
across multiple hardware peripheral devices proven to work before the
upgrade to 11.10. So it's not the hardware or their drivers. It has to
be the way information is passed to and from GIMP to the Kernel. The
compatibility problem is probably in the new kernel. It would be
interesting to find another debian based distro with the same kernel to
see if the problem can be reproduced. Or maybe it is that compounded
with a buggy Compiz. Deevad may be correct about a buggy Compiz and
Xorg.

"Compiz is one of the first compositing window managers for the X Window
System that uses 3D graphics hardware to create fast compositing desktop
effects for window management. The effects, such as a minimization
effect and a cube workspace are implemented as loadable plugins. Because
it conforms to the Inter-Client Communication Conventions Manual
standard, Compiz can substitute for the default Mutter in GNOME or KWin
in KDE."

>From http://www.davidrevoy.com/index.php?article95/linux-mint-11
-install-notes

"Correct distribution bugs :
 Linux Mint 11 comes with all the bugs of Ubuntu 11.04 Natty Narval . Bugs makes Compiz laggy ( effect for windows manager ),  problems for 3D programs and tablet. "

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https://bugs.launchpad.net/bugs/863154

Title:
  Wacom Bamboo One tablet random coordinate malfunctions

Status in “gimp” package in Ubuntu:
  Confirmed

Bug description:
  The tablet in overall seems to work correctly, with all pressure-
  features working. But quite frequently, while drawing, GIMP seems to
  wrongly read the coordinates of the stylus (as zeros, or negative
  values?), resulting in frequent, random 'line-peaks' in the direction
  of the left and upper image edges. With this bug it is hard to even
  use the tablet, since these problems are very frequent (see the
  exemplary image attached).

  The tablet works with no problems in MyPaint. The bug is reproducible
  in both Unity-2d and Unity-3d.

  I also notice the CPU usage increasing dramatically during drawing
  with any brush.

  Steps to reproduce:
  1. Connect the Wacom Bamboo One tablet
  2. Open GIMP
  3. Start drawing longer strokes with any brush

  Expected result:
  The brush stroke as intended by moving the stylus

  Actual result:
  The brush stroke as intended with frequent, random line-strokes towards image edges

  System: Ubuntu 11.10 oneiric (development branch)
  GIMP version: 2.6.11 (package version: 2.6.11-2ubuntu3)

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