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I used this link to install bumblebee on my System. I have an ASUS X550LB that uses the Intel haswell chip for graphics (i think its 4400) and Nvidia 740M. After installing as it says (no virtualgl) and trying to run

optirun <app>

It said that it couldn't recognise my secondary GPU. Also nvidia-settings gives me the following error dialog

You do not appear to be using the NVIDIA X driver.  Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.

I then came upon this post. I installed 319-update as it says corrected the entries in the bumblebee.conf file, and optirun started. But e.g in secondlife (the 3d virtual world game) i get a frame rate at about 1.9 - 2.8 per second. When I try to run

optirun nvidia-settings

I still get the same error about nvidia drivers not beeing installed. How can I tell my NVIDIA GPU is at least recognised. Also without bumblebee in the same game (secondlife) I get about 16fps while when running it without optirun but with optirun installed i get about 3.8fps. I guess they are conflicting. Any good advices? These NVIDIA packages are installed in my system right now

dpkg -l | grep -i nvidia
ii  bbswitch-dkms                             0.7-2                                         amd64        Interface for toggling the power on nVidia Optimus video cards
ii  nvidia-304                                304.88-0ubuntu8                               amd64        NVIDIA binary Xorg driver, kernel module and VDPAU library
ii  nvidia-current                            304.88-0ubuntu8                               amd64        Transitional package for nvidia-current
ii  nvidia-settings-304                       304.88-0ubuntu2                               amd64        Tool for configuring the NVIDIA graphics driver
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Anyone? I am hating nvidia so much right now!!! –  Apostolos Feb 24 at 14:07

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