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I have a nvidia geforche 825M graphics card (Optimus) and an Intel integrated graphics card. So I purged every installed nvidia driver (I tried to get a driver directly from nvidia to work, but didn't worked out) and installed nvidia-343, bumblebee and bumblebee-nvidia. I changed the bumblebee.conf to this:

# Configuration file for Bumblebee. Values should **not** be put between quotes

## Server options. Any change made in this section will need a server restart
# to take effect.
# The secondary Xorg server DISPLAY number
# Should the unused Xorg server be kept running? Set this to true if waiting
# for X to be ready is too long and don't need power management at all.
# The name of the Bumbleblee server group name (GID name)
# Card power state at exit. Set to false if the card shoud be ON when Bumblebee
# server exits.
# The default behavior of '-f' option on optirun. If set to "true", '-f' will
# be ignored.
# The Driver used by Bumblebee server. If this value is not set (or empty),
# auto-detection is performed. The available drivers are nvidia and nouveau
# (See also the driver-specific sections below)
# Directory with a dummy config file to pass as a -configdir to secondary X

## Client options. Will take effect on the next optirun executed.
# Acceleration/ rendering bridge, possible values are auto, virtualgl and
# primus.
# The method used for VirtualGL to transport frames between X servers.
# Possible values are proxy, jpeg, rgb, xv and yuv.
# List of paths which are searched for the primus libGL.so.1 when using
# the primus bridge
# Should the program run under optirun even if Bumblebee server or nvidia card
# is not available?

# Driver-specific settings are grouped under [driver-NAME]. The sections are
# parsed if the Driver setting in [bumblebeed] is set to NAME (or if auto-
# detection resolves to NAME).
# PMMethod: method to use for saving power by disabling the nvidia card, valid
# values are: auto - automatically detect which PM method to use
#         bbswitch - new in BB 3, recommended if available
#       switcheroo - vga_switcheroo method, use at your own risk
#             none - disable PM completely
# https://github.com/Bumblebee-Project/Bumblebee/wiki/Comparison-of-PM-methods

## Section with nvidia driver specific options, only parsed if Driver=nvidia
# Module name to load, defaults to Driver if empty or unset
# colon-separated path to the nvidia libraries
# comma-separated path of the directory containing nvidia_drv.so and the
# default Xorg modules path

## Section with nouveau driver specific options, only parsed if Driver=nouveau

The xorg.conf.nvidia file looks like this

Section "ServerLayout"
    Identifier  "Layout0"
    Option      "AutoAddDevices" "false"
    Option      "AutoAddGPU" "false"

Section "Device"
    Identifier  "DiscreteNvidia"
    Driver      "nvidia"
    VendorName  "NVIDIA Corporation"

#   If the X server does not automatically detect your VGA device,
#   you can manually set it here.
#   To get the BusID prop, run `lspci | egrep 'VGA|3D'` and input the data
#   as you see in the commented example.
#   This Setting may be needed in some platforms with more than one
#   nvidia card, which may confuse the proprietary driver (e.g.,
#   trying to take ownership of the wrong device). Also needed on Ubuntu 13.04.
    BusID "PCI:01:00:0"

#   Setting ProbeAllGpus to false prevents the new proprietary driver
#   instance spawned to try to control the integrated graphics card,
#   which is already being managed outside bumblebee.
#   This option doesn't hurt and it is required on platforms running
#   more than one nvidia graphics card with the proprietary driver.
#   (E.g. Macbook Pro pre-2010 with nVidia 9400M + 9600M GT).
#   If this option is not set, the new Xorg may blacken the screen and
#   render it unusable (unless you have some way to run killall Xorg).
    Option "ProbeAllGpus" "false"

    Option "NoLogo" "true"
    Option "UseEDID" "false"
    Option "UseDisplayDevice" "none"

So if I run

primusrun pymol

than I get this error:

primus: fatal: Bumblebee daemon reported: error: [XORG] (EE) NVIDIA(GPU-0): Failed   to initialize the NVIDIA GPU at PCI:1:0:0.  Please

Next I checked xorg.0.log

grep -e '(EE)' /var/log/Xorg.0.log
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[     6.175] (EE) Failed to load module "nvidia" (module does not exist, 0)
[     6.178] (EE) Failed to load module "nvidia" (module does not exist, 0)
[     6.180] (EE) [drm] KMS not enabled

I googled a lot and tried nearly everything, like deleting .conf and reinstalling but nothing seems to help. Any ideas? Bumblebee FAQ and other sites did not help me.
Thanks in advance.

EDIT: nouveau is blacklisted.

EDIT2: I think I nailed down the problem...
if I check

ls /usr/lib/xorg/modules/drivers/

NO NVIDIA driver shows up! I tried to reinstall the driver but it did not changed anything. :( why is there no NVIDIA driver? and how to fix this?

EDIT3: copying the nvidia_drv.so from the nvidia-343 folder also doesn't solve it. Running this

sudo update-alternatives --config x86_64-linux-gnu_gl_conf

Selection    Path                                       Priority   Status
  0            /usr/lib/nvidia-343/ld.so.conf              8604      auto mode
  1            /usr/lib/nvidia-343-prime/ld.so.conf        8603      manual mode
  2            /usr/lib/nvidia-343/ld.so.conf              8604      manual mode
* 3            /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf   500       manual mode

and changing to "0" doesn't work either. After reboot back to "3".

EDIT4: Really looks like that ONLY the nvidia-331.49 driver is supporting my graphics card. I'll try again with this one. If I'm wrong please correct me.

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