https://bugs.freedesktop.org/show_bug.cgi?id=69463
--- Comment #4 from Michel Dänzer michel@daenzer.net --- How are you starting the X server? Does the shell which starts the X server contatin the environment variable EGL_PLATFORM=x11, or does it help if you set EGL_PLATFORM=drm?
Either way, please set the environment variable EGL_LOG_LEVEL=debug for starting the X server and attach its stderr output.