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The reason I'm asking is that none of the games I've installed through software center that require 3D accelartion like TORCS for instance will run. When I try to run then, nothing happens. I have a Dell Inspiron N5110 with a nVidia GeForce GT 525M.

I tried the following which I were some suggestions for people with similar problems:

lspci -v

Which gave me:

01:00.0 VGA compatible controller: nVidia Corporation Device 0df5 (rev a1) (prog-if 00 [VGA controller])
    Subsystem: Dell Device 04ca
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at f5000000 (32-bit, non-prefetchable) [size=16M]
    Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Memory at f0000000 (64-bit, prefetchable) [size=32M]
    I/O ports at e000 [size=128]
    Expansion ROM at f6000000 [disabled] [size=512K]
    Capabilities: <access denied>
    Kernel driver in use: nvidia
    Kernel modules: nvidia_current, nvidia_current_updates, nvidia, nouveau, nvidiafb

I also tried:

egrep -i " connected|card detect|primary dev" /var/log/Xorg.0.log

Which gave me:

[    20.873] (II) intel(0): Output LVDS1 connected


nvidia-smi -a

Which gave:

NVIDIA: could not open the device file /dev/nvidiactl (No such file or directory).
Nvidia-smi has failed because it couldn't communicate with NVIDIA driver. Make sure that latest NVIDIA driver is installed and running.

I don't really understand what all this means. Please help.

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I know the question is old, but I found a solution which I hasn't find on other topic.

Open a terminal and type

lspci -vnnn | perl -lne 'print if /^\d+\:.+(\[\S+\:\S+\])/' | grep VGA

Your output will be something like that:

00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) 

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Chelsea LP [Radeon HD 7730M] [1002:682f] (rev ff) (prog-if ff)

Now look for the [VGA controller] at the end of each device. Whatever device has it, is the active GPU. In my case it's the i7 processor (HD 4000) that's handling the work.

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Not really... lspci -vnnn | perl -lne 'print if /^\d+\:.+([\S+\:\S+])/' | grep VGA 00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK107M [GeForce GT 650M] [10de:0fd1] (rev a1) (prog-if 00 [VGA controller]) – Anne van Rossum Feb 22 '15 at 16:55
@AnnevanRossum Did you get any solution to this? I have the exact same issue as you with two [VGA controller]. – Einar Sundgren Mar 5 '15 at 20:38
@EinarSundgren I gave up bumblebee for nvidia optimus ( which allows you to switch with prime-select. – Anne van Rossum Mar 6 '15 at 14:03
lspci -v | grep "VGA controller" should do the trick in this case... what an overblown way to get the same result... – Cestarian Feb 23 at 12:45

I found this (if you have NVidia and intel graphic cards):

I think the following command should give you an indication of your active chip:

$ glxinfo|egrep "OpenGL vendor|OpenGL renderer*"

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile*

If you switched to NVidia card:

$ optirun glxinfo|egrep "OpenGL vendor|OpenGL renderer"

OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GT 555M/PCIe/SSE2
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On Ubuntu 15.10, after I installed nvidia-352 and the GPU seems to work:


shows something like:

enter image description here

Note how it shows:

GPU 0 - (NVS 5400M)

where NVS 5400M is my GPU model. Also tested on a Quadro K1100M. This did not show up before I had installed the driver.

Also if I fire:

sudo apt-get install mesa-utils

the GPU usage goes to > 90%, further sign that it is working.

But in the end the ultimate test is to do a benchmark with / without GPU and see your FPS goes way up or not: How to perform a detailed and quick 3D performance test

Similar on Launchpad:

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