Cannot access secondary GPU - error: Could not load GPU driver

I tried multiple different drives, nvidia-340, nvidia-331, nvidia-331-updates, nvidia-343 and with the same result:

# optirun -vv --debug bash
    [  785.862681] [DEBUG]Reading file: /etc/bumblebee/bumblebee.conf
    [  785.863474] [INFO]Configured driver: nvidia
    [  785.863827] [DEBUG]optirun version 3.2.1 starting...
    [  785.863890] [DEBUG]Active configuration:
    [  785.863929] [DEBUG] bumblebeed config file: /etc/bumblebee/bumblebee.conf
    [  785.863970] [DEBUG] X display: :8
    [  785.864056] [DEBUG] LD_LIBRARY_PATH: /usr/lib/nvidia-331-updates:/usr/lib32/nvidia-331-updates
    [  785.864092] [DEBUG] Socket path: /var/run/bumblebee.socket
    [  785.864120] [DEBUG] Accel/display bridge: auto
    [  785.864148] [DEBUG] VGL Compression: proxy
    [  785.864175] [DEBUG] VGLrun extra options: 
    [  785.864212] [DEBUG] Primus LD Path: /usr/lib/x86_64-linux-gnu/primus:/usr/lib/i386-linux-gnu/primus
    [  785.864329] [DEBUG]Using auto-detected bridge virtualgl
    [  785.878755] [INFO]Response: No - error: Could not load GPU driver
    [  785.878771] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver
    [  785.878775] [DEBUG]Socket closed.
    [  785.878790] [ERROR]Aborting because fallback start is disabled.
    [  785.878794] [DEBUG]Killing all remaining processes.

My Linux kernel

# uname -r


# cat /etc/bumblebee/bumblebee.conf
    # 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 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
    ## 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 and the
    # default Xorg modules path
    ## Section with nouveau driver specific options, only parsed if Driver=nouveau


# cat /etc/bumblebee/xorg.conf.nvidia
    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"


# lspci | grep NVIDIA
    01:00.0 3D controller: NVIDIA Corporation GK107M [GeForce GT 750M] (rev a1)


# dpkg -l | grep nvidia
    ii  bumblebee-nvidia                                            3.2.1-90~trustyppa1                                    amd64        NVIDIA Optimus support using the proprietary NVIDIA driver
    ii  nvidia-331-updates                                          331.38-0ubuntu7.1                                      amd64        NVIDIA binary driver - version 331.38
    ii  nvidia-libopencl1-331-updates                               331.38-0ubuntu7.1                                      amd64        NVIDIA OpenCL Driver and ICD Loader library
    ii  nvidia-opencl-icd-331-updates                               331.38-0ubuntu7.1                                      amd64        NVIDIA OpenCL ICD
    ii  nvidia-prime                                                0.6.2linuxmint1                                        amd64        Tools to enable NVIDIA's Prime
    ii  nvidia-settings                                             343.13-0ubuntu1~xedgers14.04.1                         amd64        Tool for configuring the NVIDIA graphics driver


# dmesg | grep nv
    [    0.658496] rtc_cmos 00:06: alarms up to one month, y3k, 242 bytes nvram, hpet irqs
    [   29.242070] nvidia: module license 'NVIDIA' taints kernel.
    [  362.966609] nvidia: disagrees about version of symbol drm_pci_init
    [  362.966613] nvidia: Unknown symbol drm_pci_init (err -22)
    [  362.966659] nvidia: disagrees about version of symbol drm_gem_prime_handle_to_fd
    [  362.966660] nvidia: Unknown symbol drm_gem_prime_handle_to_fd (err -22)
    [  362.966678] nvidia: disagrees about version of symbol drm_gem_private_object_init
    [  362.966679] nvidia: Unknown symbol drm_gem_private_object_init (err -22)
    [  362.966746] nvidia: disagrees about version of symbol drm_gem_handle_create
    [  362.966747] nvidia: Unknown symbol drm_gem_handle_create (err -22)
    [  362.966796] nvidia: disagrees about version of symbol drm_pci_exit
    [  362.966797] nvidia: Unknown symbol drm_pci_exit (err -22)
    [  362.966822] nvidia: disagrees about version of symbol drm_gem_prime_export
    [  362.966823] nvidia: Unknown symbol drm_gem_prime_export (err -22)


# dmesg | grep bb
    [    0.000000] PM: Registered nosave memory: [mem 0xcb000000-0xcbbfffff]
    [    0.256795] e820: reserve RAM buffer [mem 0xb9bea000-0xbbffffff]
    [    0.256796] e820: reserve RAM buffer [mem 0xba429000-0xbbffffff]
    [    0.661515] Loaded X.509 cert 'Magrathea: Glacier signing key: 2cb1133b35f95a9e24deabeeb12ba449bcbabbc9'
    [    4.377136] bbswitch: version 0.8
    [    4.377141] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
    [    4.377144] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
    [    4.377230] bbswitch: detected an Optimus _DSM function
    [    4.377275] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
    [    4.378990] bbswitch: disabling discrete graphics
    [   28.392635] bbswitch: enabling discrete graphics
    [  308.876566] bbswitch: disabling discrete graphics
    [  362.505917] bbswitch: enabling discrete graphics


I experience problems like yours, in my case even if I thought I had two graphic devices(chipset INTEL and NVIDIA card) NVDIA is only visible and viewed by the Os… No hope to use hybrid solutions. You can verify that by typing :

lspci | grep VGA

if you get one line only (like me) forget about hybrid solutions except if NVIDIA provides one day optimus support for linux

lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation GK107GLM [Quadro K2000M] (rev a1)

Hope that helps… If you are in the same situation than me let us cry together or build a lobby ;-)


Well I’m not sure if bumbleebee has any official nvidia support, it’s open source project for getting optimus to work. But anyhow a bit of googling this seems to have very similar nvidia driver error:

Another way, which I think is nvidia’s official way for optimus laptops, is in driver readme:
Chapter 32. Offloading Graphics Display with RandR 1.4.

Yes, we are on the same boat except that my intel is my default graphics card:

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)

Ok, I got it working now:

I fixed it myself. I stumbled upon this thread since I also installed the latest drivers;

But I did the instructions:

sudo apt-get purge i915-3.15-3.13-dkms
    sudo apt-get install --reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
    sudo dpkg-reconfigure xserver-xorg
    sudo apt-get install --reinstall nvidia-340
    sudo dpkg-reconfigure bbswitch-dkms
    sudo reboot

But it didn’t work for me, so I searched some more. I found this bug report and tried these instructions (

sudo ldconfig -n
    sudo update-initramfs -u
    sudo reboot

Eureka, it worked!

Hello Domzz!

Since I can’t active optirun, then I run the command

sudo ldconfig -n
    sudo update-initramfs -u
    sudo reboot

as you said,

and now I can’t log in to the tty or my kdm, what happend, any ideas?