Created attachment 113241 [details]
Screenshot of Plasma 2

Hi there,
I don't know where to start because I just migrated to Plasma 2 and got this
black texture (see attachment).

Everything is fine using Qt4, so I suppose this could be a Qt issue? But then I
used vesa as Xorg driver and the texture is painted correctly.
The same black texture is used in SDDM too, which is also a Qt5 application.

Any idea on where to start?

NVIDIA FX 5500, Xorg 1.16.3, mesa 10.4.4, nouveau 1.0.11, Qt 5.4.0