how do i can make ubuntu on my laptop to use Nvidia840M graphics card

Does the system have a make and model?

If you run:

sudo lshw -C display; lsb_release -a; uname -a

What is the output?

Thanks

aditya@aditya-Aspire-E5-571G:~$ sudo lshw -C display
[sudo] password for aditya:
  *-display
       description: VGA compatible controller
       product: Haswell-ULT Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 0b
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:64 memory:b3000000-b33fffff memory:c0000000-cfffffff ioport:5000(size=64)
aditya@aditya-Aspire-E5-571G:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
aditya@aditya-Aspire-E5-571G:~$ uname -a
Linux aditya-Aspire-E5-571G 3.13.0-53-generic #89-Ubuntu SMP Wed May 20 10:34:39 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
aditya@aditya-Aspire-E5-571G:~$

my laptop is acer aspire E5-571G-52R7
Intel core i5-4210U 1.7 GHz
NVIDIA GeForce 840M with 2 GB Dedication VRAM

when install lsb-core,i go the following output

LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty

Is the nvidia GPU enabled in BIOS?

i donot know

how i can see whether it is enabled or not.
what is bios

in bios setup nvidia gpu option is not coming

ALl i can suggest is report a bug. Is it different on mains power and battery ?

i did not understand what you are saying actionparnship

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