Then I came across bumblebee project for optimus graphics cards and followed instructions on
https://wiki.ubuntu.com/Bumblebee#Installation
inxi -Gx output-
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Graphics: Card-1: Intel 3rd Gen Core processor Graphics Controller bus-ID: 00:02.0
Card-2: NVIDIA GF108 [GeForce GT 630M] bus-ID: 01:00.0
X.Org: 1.13.0 drivers: intel (unloaded: fbdev,vesa) Resolution: 1366x768@60.0hz
GLX Renderer: Mesa DRI Intel Ivybridge Mobile GLX Version: 3.0 Mesa 9.0 Direct Rendering: Yes
&following error is displayed...
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[ 1401.636471] [ERROR]The Bumblebee daemon has not been started yet or the socket path /var/run/bumblebee.socket was incorrect.
[ 1401.636510] [ERROR]Could not connect to bumblebee daemon - is it running?