Another fallout from the dbus adventure: After I had othalla up and running again, I noticed that the graphic performance was really bad. Playing movies wasn’t moving at all, it was more like a slideshow.
Xorg.0.log said:
[ 4978.363] (EE) NVIDIA(0): Failed to initialize the GLX module; please check in your X [ 4978.363] (EE) NVIDIA(0): log file that the GLX module has been loaded in your X [ 4978.363] (EE) NVIDIA(0): server, and that the module is the NVIDIA GLX module. If [ 4978.363] (EE) NVIDIA(0): you continue to encounter problems, Please try [ 4978.363] (EE) NVIDIA(0): reinstalling the NVIDIA driver.
Strange… Turns out X loaded the xorg glx module from /usr/lib/xorg/modules/extensions instead the right one from /usr/lib/nvidia/xorg. No idea why, but adding:
Section "Files"
ModulePath "/usr/lib/nvidia/xorg"
ModulePath "/usr/lib/xorg/modules"
...
EndSection
to xorg.conf before the regular path /usr/lib/xorg/modules fixed it.