I have an Optimus laptop, a Dell XPS 15 L502, which I've had for a few years and have tried various things on (bumblebee, nvidia-prime, linux kernel optimus support).
The graphics card is an NVIDIA GT 540M.
I upgraded to Ubuntu 14.04 a few days ago and wanted to try
nvidia-prime again (it wasn't working so great for me on 13.10), but
nvidia-settings only tells me that it is not supported.
Software and Updates recognises the Nvidia card and drivers. Nvidia Settings currently gives me this:
** Message: PRIME: No offloading required. Abort ** Message: PRIME: is it supported? no
I've tried to purge and reinstall nvidia drivers a dozen times, I've tried with and without
xorg.conf files, but still always the same thing.
I've followed all the guides I could find on Stack Overflow, Ask Ubuntu, and various other places.
EDIT: I was having problem with booting into "low-graphics mode", but that was due to a bad
lightdm configuration that broke when I upgraded. I also had some segmentation fault issues with
nvidia-settings installing the wrong version of itself (this was fixed by reinstalling just
EDIT: Have also found this bug report: https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1283439