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I know that in Ubuntu 14.04 there exists nvidia-prime for Nvidia Optimus, but I don't like it and neither am I able to get it work. After upgrading from Ubuntu 12.04 everything crashed, and I made a clean install of Ubuntu 14.04 and Bumblebee, but now I have new troubles. After running optirun glxgears I get the following error:

**[ 4703.996785] [ERROR]Cannot access secondary GPU, secondary X is not active.**
**[ 4703.996910] [ERROR]Aborting because fallback start is disabled.**

Please help.

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CHeck this thread askubuntu.com/questions/452556/… –  Ubuntuser May 1 at 9:21

2 Answers 2

I believe that you need to set up a virtual server for your image output. I am not sure on 14.04, but I know this works for me on upgrading to 13.10 from 12.04. It is not specific to 14.04, but if you are stumped, this answer should provide some guidance:

External Monitor display on Thinkpad W520 with 12.04

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From: https://wiki.debian.org/Bumblebee#Common_issues

I had to edit the file '/etc/bumblebee/bumblebee.conf' and set the driver manually :

Driver=nvidia

You should have a corresponding [driver-nvidia] section in your file with the current version of your nvidia driver :

[driver-nvidia]
# KernelDriver=nvidia-current
KernelDriver=nvidia-331
# LibraryPath=/usr/lib/nvidia-current:/usr/lib32/nvidia-current
LibraryPath=/usr/lib/nvidia-331:/usr/lib32/nvidia-331
# XorgModulePath=/usr/lib/nvidia-current/xorg,/usr/lib/xorg/modules
XorgModulePath=/usr/lib/nvidia-331/xorg,/usr/lib/xorg/modules

then restart the bumblebee daemon :

sudo service bumblebeed restart 
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