It is not supposed to reboot, you should do that manually.
Actually, you don't have to reboot, logoff/logon is enough.
If you would like to automate the process, refer to prime-indicator package.
Instalation guide can be found on the following link (valid on March 19, 2015):
http://www.webupd8.org/2014/01/prime-indicator-lets-you-quickly-switch.html .
** Changed in: nvidia-prime (Ubuntu)
Status: New => Invalid
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Packages, which is subscribed to nvidia-prime in Ubuntu.
https://bugs.launchpad.net/bugs/1389199
Title:
NVIDIA-340. 46 and NVIDIA 331.38
Status in nvidia-prime package in Ubuntu:
Invalid
Bug description:
My Dell-XPS 15 l502x, doesn't reboot automatically when I select in
Nvidia X Server Settings the mode Intel (Power Saving Mode)
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: nvidia-prime 0.6.2
Uname: Linux 3.16.7-031607-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Nov 4 12:48:32 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-11-04 (0 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64
(20140722.2)
SourcePackage: nvidia-prime
UpgradeStatus: No upgrade log present (probably fresh install)
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