Added a troubleshooting section about Nvidia drivers (#114)

README.md

@@ -236,3 +236,9 @@ to the fieldbus scanner can be established (note: This is only to get the
 `External Control` running. You probably want to make sure that a connection to
 the fieldbus scanner can indeed be made). If you don't use EtherNet/IP
 fieldbusses at all, you can disable it in the same installation screen. 
+
+### I cannot get a realtime kernel running together with an NVIDIA graphics card
+This is a known issue and unfortunately we don't have a solution for this. The Nvidia kernel module
+seems to not compile with every kernel. We recommend to use a multi-machine ROS setup in this
+situation where a realtime-system is running the robot driver and a separate machine is performing
+the computations requiring the graphics card.