Hi!

There is no pressure with Genius Mousepen i608X tablet in blender. Nor in sculpting nor in texture painting.
This device works with the evdev driver. (I am using xubuntu 64-bit with a pathed 3.2.0-24 kernel which conatains the driver for this device.)
I figured out how to make the pressure work: I have modified the intern/ghost/intern/GHOST_WindowX11.cpp file.
around line 608 I have coded the following:
instead of this:
if (m_xtablet.StylusDevice == NULL && is_stylus(device_info[i].name, device_type))
I coded this:
if (m_xtablet.StylusDevice == NULL && (is_stylus(device_info[i].name, device_type) || device_info[i].type == XInternAtom(m_display, XI_TABLET, False)))

And of course I modified the tilt code a little bit, since this device does not support tilting in this way:
if (xvi->num_axes > 3) {
m_xtablet.XtiltLevels = xvi->axes[3].max_value;
m_xtablet.YtiltLevels = xvi->axes[4].max_value;
}
else {
m_xtablet.XtiltLevels = 0;
m_xtablet.YtiltLevels = 0;
}
}

May be this is not the best idea to code this in this way, but this is worked for me now I got pressure with my device in both cases.

In my opinion this code may work with other non-wacom tablets wich uses the evdev driver. You can find those tablets list here:
http://sourceforge.net/apps/mediawiki/digimend/index.php?title=Tablet_support_status

I have attached the patch file and my current GHOST_WindowX11.cpp file (because I was not quite sure that I have genereated the patch correctly)