Instead of "llvmpipe (LLVM 6.0, 256 bits)" the active OpenGL renderer is now:
$ glxgears -info
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
GL_RENDERER = GeForce 940M/PCIe/SSE2
GL_VERSION = 4.6.0 NVIDIA 396.37
GL_VENDOR = NVIDIA Corporation
Thank you @xjbhenry (xjbhenry)!
His fix [21](https:/ /bugs.launchpad .net/ubuntu/ +source/ xorg/+bug/ 1752938/ comments/ 21), helped me for my NVIDIA card.
Instead of "llvmpipe (LLVM 6.0, 256 bits)" the active OpenGL renderer is now:
$ glxgears -info
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
GL_RENDERER = GeForce 940M/PCIe/SSE2
GL_VERSION = 4.6.0 NVIDIA 396.37
GL_VENDOR = NVIDIA Corporation