How do I install Optimus/nVIDIA on a Dell M4800 (Quadro K1100M)

[Bashing-om]

cement_head; Well ....

Does the system now see that there are 2 graphics sets ?

lspci | grep "VGA\|3D"
sudo ubuntu-drivers devices

If so, then:

dpkg -l | grep -i nvidia

see if 'nvidia-settings' is installed. If not see what results when it is installed.
It is 'nvidia-settings' that controls which graphic's set is active in a optimus situation.

if it is, it is

[frogotronic]

Yes! But one has to check it in the BIOS. Using 12.04, the switching doesn't work. Is there an updated NVIDIA-PRIME that I need to install?

[Bashing-om]

cement_head; Hummm ...

Beats me up too presently . If the Intel graphic's set is enabled in bios, and the system now sees both graphic's sets;
It is from within nvidia-settings that one chooses the graphic set to use upon next log in . yeah choose and logout/login .
As to a different version of nvidia-settings, nope; What we have in the repo is what we should be working with . Else one can get into all kinds of trouble with differing version libraries and support files .

the fight goes on