Enabling pressure control on gimp-2.4.7, slackware linux 12.1, G-Pen 450.

[Victor <ErV2005@xxxxxxxxxx>]

Hello.

	I'm trying to make pressure control work in gimp-2.4.7 on G-Pen 450 graphic 
tablet, on slackware 12.1. 

Problem:
1) If in Edit->preferences->Input Devices->configure advanced input devices, 
tablet device mode is set to "disabled", pressure control doesn't work and I 
can draw only lines with constant thickness/opacity/etc. (as with mouse)
2) If in Edit->preferences->Input Devices->configure advanced input devices, 
tablet device mode is set to "Screen" or "Window", pressure control doesn't 
work, because when I press pen, pen cursor stops moving (i.e. freezes) until 
I stop pressing it. I.e. I can place "dots" by pen, but can't draw lines.

Additional info:
1) Pressure controls work fine in inkscape (version 0.46) or krita (from KDE 
3.5.7). Krita detects presure automatically (because device is named 
as "stylus"), inkscape can use it, when in file->input devices device mode is 
set to "screen" or "window". However when I'm trying to use similar settings 
for tablet in gimp, cursor simply freezes when I try to draw something.
2) gimp 2.4.7 is built from source. In the gimp-2.4.5 (bundled with slackware 
12.1) pressure controls didn't work either. 
3) I'm using wizardpen 0.6.0.2 driver.
4) I've been using this(http://ubuntuforums.org/showthread.php?t=228991) and 
this(https://help.ubuntu.com/community/TabletSetupWizardpen) to configure 
tablet. Unfortunately, HOWTOs has gimp-related content removed, and FAQ on 
gimp site doesn't seem to mention anything related to my problem.
5) xorg.conf sections related to tablet(not sure if it's relevant to problem, 
because pressure control work in krita/inkscape):
Code:
---
...
Section "ServerLayout"
    Identifier     "X.org Configured"
    Screen      0  "Screen0" 0 0
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice	   "stylus" "SendCoreEvents"
EndSection
...
Section "InputDevice"
	Identifier      "stylus"
	driver          "wizardpen"
	Option		"Type"		"stylus"
        Option          "Device"        "/dev/tablet-event"
	Option          "TopX"          "157"
	Option          "TopY"          "85"
	Option          "BottomX"       "32739"
	Option          "BottomY"       "32745"
	Option          "MaxX"          "32739"
	Option          "MaxY"          "32745"
EndSection
...
--

I'd like to know how to solve this problem and how to make pressure control to 
work in gimp on Linux (maybe I just missed some settings in gimp?). 
Suggestions are welcome.
-- 
With best regards, Victor

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