Comment 2 for bug 1577041

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Jan W (ubuntu-kiekerjan) wrote : Re: Cannot login to kubuntu after upgrade

More googling suggests this has to do with using bumblebee to use the nvidia and intel GPUs. I used the following blog to install the nvidia drivers.

http://lenovolinux.blogspot.nl/2016/05/bumblebee-on-lenovo-t440p-nvidia-gt.html

I can now use either GPU at my disposal:

$ glxgears -info
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
GL_RENDERER = Mesa DRI Intel(R) HD Graphics 520 (Skylake GT2)
GL_VERSION = 3.0 Mesa 11.2.0
GL_VENDOR = Intel Open Source Technology Center

$ optirun glxgears -info
GL_RENDERER = GeForce 940M/PCIe/SSE2
GL_VERSION = 4.5.0 NVIDIA 361.42
GL_VENDOR = NVIDIA Corporation