Comment 62 for bug 1431753

Fix confirmed on 2 very different machines both running Ubuntu 14.04 "Trusty" with the 3.13 kernel. Detailed notes:

AMD workstation with only a discrete nvidia GPU (nothing else)
====================================================
Synaptic complained about conflicts when selecting updated driver from trusty-proposed (something involving nvidia-libopencl1-* vs nvidia-opencl-icd-* IIRC). Installing through aptitude worked better. No further issues when rebooting, updating the kernel and rebooting again.

Intel laptop running bumblebee
==========================
Blank screen after updating. Solutions tried:
(1) starting the kernel with nogpumanager and removing /etc/X11/xorg.conf generated by gpu-manager
(2) removing the newly created file /etc/prime-discrete
(3) sudo sed -i 's/-current/-346-updates/g' /etc/bumblebee/bumblebee.conf
(4) adding lines for 340 and 346 to /etc/modprobe.d/bumblebee.conf

Applying all of the above fixed the problem, and (1)-(3) without (4) didn't, so it's very likely that (4) is necessary. What I cannot tell is which of (1)-(3) are also necessary and which are optional.(*) Bottom line is that special precautions should be taken to prevent bumblebee from breaking when rolling this out.

(*) I could of course figure that out by reverting the changes one-by-one, but this bug already robbed me of an outrageous amount of my time and all of my goodwill, so you're on your own. Thanks a lot for finally fixing it, though.