I think i found the culprit: I use the debian apt repo for machinekit and the rt kernel: deb [arch=armhf] http://repos.rcn-ee.com/debian/ stretch main
This repo installs libGL.so.1.0.0 instead of libGL.so.1.2.0. I forced to use the default debian apt source repo and purged all libgl stuff from the rcnee repo. And now i get: > glxinfo|head name of display: localhost:10.0 display: localhost:10 screen: 0 direct rendering: No (LIBGL_ALWAYS_INDIRECT set) server glx vendor string: NVIDIA Corporation server glx version string: 1.4 perfect! So it seems like the libGL package is somehow messed up or not up to date on the repo server I use because of the machinekit stuff. I contacted the owner of the repo and I will wait for his reply.
