Calligraphy tool's pressure-sensitivity doesn't work in 0.48+devel r11928

[Mechanical snail]

Running Inkscape 0.48+devel r11928 from the daily builds PPA on Ubuntu Precise (32-bit PAE) in a KDE session. Computer is a Thinkpad tablet.

I enabled tablet stylus input using Edit > Input Devices, and clicking the corresponding checkbox. I left the right-side option as the default, "Screen" (but it still didn't work when I tried "Window" afterwards). I also enabled pressure sensitivity by checking the "Use pressure-sensitive tablet (requires restart)" checkbox. (See screenshot.) I then closed and reopened Inkscape.

In the Input Devices pane > Hardware tab > Test Area, Inkscape correctly recognizes the pressure (2 screenshots shown, with the pen touched lightly and heavily). The Calligraphy tool has "Use the pressure...to alter the width" enabled. However, when actually drawing, the calligraphy tool seems to ignore the pressure readings.

Pressure sensitivity works correctly in GIMP (also Screen mode; it shows up there as Pressure = axis 3).

[su_v (suv-lp)]

> Running Inkscape 0.48+devel r11928 from the daily builds PPA on
> Ubuntu Precise (32-bit PAE) in a KDE session.
> Computer is a Thinkpad tablet.

Based on the screenshots, Inkscape uses Ubuntu's custom overlay scrollbars, which apparently break pressure sensitivity for (Wacom) tablets in Inkscape (confirmed on Natty, Precise and later versions of Ubuntu).

A workaround is to launch Inkscape from the terminal, with the custom overlay scrollbars disabled:

$ LIBOVERLAY_SCROLLBAR=0 inkscape

Linking as duplicate to Bug #790130 “no pressure sensitivity with wacom tablet in inkscape“ - please add a comment here and revert the duplicate status if you don't agree and think this must be different issues, which require to be tracked separately.