Comment 37 for bug 194851

I think I fix the problem : the fwb module loaded by the X server (libwfb.so) can by provided by the Nvidia Corp. or Xorg, so it seems that when it's the Nvidia fwb version the problem seams to appear, consequently if we turn the symbolic link /usr/lib/xorg/modules/libwfb.so to /usr/lib/nvidia/libwfb.so.xserver-xorg-core (the Xorg version instead) , the problem seems to be fixed...