# Bumblebee

Related articles

- NVIDIA Optimus
- Nouveau
- NVIDIA
- Intel graphics

From Bumblebee's FAQ:

"Bumblebee is an effort to make NVIDIA Optimus enabled laptops work in GNU/Linux systems. Such feature involves two graphics cards with two different power consumption profiles plugged in a layered way sharing a single framebuffer."

## Bumblebee: Optimus for Linux

Optimus Technology is a hybrid graphics implementation without a hardware multiplexer. The integrated GPU manages the display while the dedicated GPU manages the most demanding rendering and ships the work to the integrated GPU to be displayed. When the laptop is running on battery supply, the dedicated GPU is turned off to save power and prolong the battery life. It has also been tested successfully with desktop machines with Intel integrated graphics and an nVidia dedicated graphics card.

Bumblebee is a software implementation comprising of two parts:

- Render programs off-screen on the dedicated video card and display it on the screen using the integrated video card. This bridge is provided by VirtualGL or primus (read further) and connects to a X server started for the discrete video card.
- Disable the dedicated video card when it is not in use (see the #Power management section)

It tries to mimic the Optimus technology behavior; using the dedicated GPU for rendering when needed and power it down when not in use. The present releases only support rendering on-demand, automatically starting a program with the discrete video card based on workload is not implemented.

## Installation

Before installing Bumblebee, check your BIOS and activate Optimus (older laptops call it "switchable graphics") if possible (BIOS doesn't have to provide this option). If neither "Optimus" or "switchable" is in the bios, still make sure both gpu's will be enabled and that the integrated graphics (igfx) is initial display (primary display). The display should be connected to the onboard integrated graphics, not the discrete graphics card. If integrated graphics had previously been disabled and discrete graphics drivers installed, be sure to remove `/etc/X11/xorg.conf` or the conf file in `/etc/X11/xorg.conf.d` related to the discrete graphics card.

### Installing Bumblebee with Intel/NVIDIA

Install:

- bumblebee - The main package providing the daemon and client programs.

  Note: bumblebee depends on mesa-libgl and provides all nvidia-libgl, nvidia-340xx-libgl and nvidia-304xx-libgl to avoid dependency conflict between the respective libgl versions.

- mesa - An open-source implementation of the OpenGL specification.
- xf86-video-intel - Intel driver.
- nvidia or nvidia-340xx or nvidia-304xx - Install appropriate NVIDIA driver. For more information read NVIDIA#Installation.

For 32-bit (Multilib must be enabled) applications support on 64-bit machines, install:

- lib32-virtualgl - A render/display bridge for 32 bit applications.
- lib32-nvidia-utils or lib32-nvidia-340xx-utils or lib32-nvidia-304xx-utils - match the version of the 64 bit package.
- lib32-mesa-libgl and make sure that lib32-nvidia-libgl is not installed

In order to use Bumblebee, it is necessary to add your regular user to the `bumblebee` group:

    # gpasswd -a user bumblebee

Also enable `bumblebeed.service`. Reboot your system and follow #Usage.

### Installing Bumblebee with Intel/Nouveau

This article or section needs expansion.

Reason: please use the first argument of the template to provide a brief explanation. (Discuss in Talk:Bumblebee#)
Warning: This method is deprecated and will most likely not work anymore. Use the nvidia module instead. If you want nouveau, use PRIME.

Install:

- xf86-video-nouveau - experimental 3D acceleration driver.
- mesa - Mesa classic DRI with Gallium3D drivers and 3D graphics libraries.

Note: If, when using `primusrun` on a system with the nouveau driver, you are getting:

    primus: fatal: failed to load any of the libraries: /usr/$LIB/nvidia/libGL.so.1
    /usr/$LIB/nvidia/libGL.so.1: Cannot open shared object file: No such file or directory

You should add the following in `/usr/bin/primus` after `PRIMUS_libGL`:

    export PRIMUS_libGLa='/usr/$LIB/libGL.so.1'

If you want, create a new script (for example primusnouveau).

## Usage

### Test

Install mesa-demos and use `glxgears` to test if if Bumblebee works with your Optimus system:

    $ optirun glxgears -info

If it fails, try the following commands:

- 64 bit system:

    $ optirun glxspheres64

- 32 bit system:

    $ optirun glxspheres32

If the window with animation shows up, Optimus with Bumblebee is working.

Note: If `glxgears` failed, but `glxspheresXX` worked, always replace "`glxgears`" with "`glxspheresXX`" in all cases.

### General usage

    $ optirun [options] application [application-parameters]

For example, start Windows applications with Optimus:

    $ optirun wine application.exe

For another example, open NVIDIA Settings panel with Optimus:

    $ optirun -b none nvidia-settings -c :8

  Note: A patched version of nvdock is available in the package nvdock-bumblebeeAUR

For a list of the options for `optirun`, view its manual page:

    $ man optirun

## Configuration

You can configure the behaviour of Bumblebee to fit your needs. Fine tuning like speed optimization, power management and other stuff can be configured in `/etc/bumblebee/bumblebee.conf`

### Optimizing speed

#### Using VirtualGL as bridge

Bumblebee renders frames for your Optimus NVIDIA card in an invisible X Server with VirtualGL and transports them back to your visible X Server. Frames will be compressed before they are transported - this saves bandwidth and can be used for speed-up optimization of bumblebee:

To use another compression method for a single application:

    $ optirun -c compress-method application

The method of compress will affect performance in the GPU/CPU usage. Compressed methods will mostly load the CPU. However, uncompressed methods will mostly load the GPU.

Compressed methods

  - `jpeg`
  - `rgb`
  - `yuv`

Uncompressed methods

  - `proxy`
  - `xv`

Here is a performance table tested with ASUS N550JV laptop and benchmark app unigine-heavenAUR:

Command | FPS | Score | Min FPS | Max FPS
--- | --- | --- | --- | ---
optirun unigine-heaven | 25.0 | 630 | 16.4 | 36.1
optirun -c jpeg unigine-heaven | 24.2 | 610 | 9.5 | 36.8
optirun -c rgb unigine-heaven | 25.1 | 632 | 16.6 | 35.5
optirun -c yuv unigine-heaven | 24.9 | 626 | 16.5 | 35.8
optirun -c proxy unigine-heaven | 25.0 | 629 | 16.0 | 36.1
optirun -c xv unigine-heaven | 22.9 | 577 | 15.4 | 32.2

Note: Lag spikes occurred when `jpeg` compression method was used.

To use a standard compression for all applications, set the `VGLTransport` to `compress-method` in `/etc/bumblebee/bumblebee.conf`:

    /etc/bumblebee/bumblebee.conf

    [...]
    [optirun]
    VGLTransport=proxy
    [...]

You can also play with the way VirtualGL reads back the pixels from your graphic card. Setting `VGL_READBACK` environment variable to `pbo` should increase the performance. Compare these two:

    # PBO should be faster.
    VGL_READBACK=pbo optirun glxgears
    # The default value is sync.
    VGL_READBACK=sync optirun glxgears

Note: CPU frequency scaling will affect directly on render performance

#### Primusrun

Note: Since compositing hurts performance, invoking primus when a compositing WM is active is not recommended. See #Primus issues under compositing window managers.

`primusrun` (from package primus) is becoming the default choice, because it consumes less power and sometimes provides better performance than `optirun`/`virtualgl`. It may be run separately, but it does not accept options as `optirun` does. Setting `primus` as the bridge for `optirun` provides more flexibility.

For 32-bit applications support on 64-bit machines, install lib32-primus (multilib must be enabled).

Usage (run separately):

    $ primusrun glxgears

Usage (as a bridge for `optirun`):

The default configuration sets `virtualgl` as the bridge. Override that on the command line:

    $ optirun -b primus glxgears

Or, set `Bridge=primus` in `/etc/bumblebee/bumblebee.conf` and you won't have to specify it on the command line.

Tip: Refer to #Primusrun mouse delay/disable VSYNC if you want to disable `VSYNC`. It can also remove mouse input delay lag and slightly increase the performance.

### Power management

The goal of the power management feature is to turn off the NVIDIA card when it is not used by Bumblebee any more. If bbswitch (or bbswitch-dkms) is installed, it will be detected automatically when the Bumblebee daemon starts. No additional configuration is necessary. However, bbswitch is for Optimus laptops only and will not work on desktop computers. So, Bumblebee power management is not available for desktop computers, and there is no reason to install bbswitch on a desktop. (Nevertheless, the other features of Bumblebee do work on some desktop computers.)

#### Default power state of NVIDIA card using bbswitch

The default behavior of bbswitch is to leave the card power state unchanged. `bumblebeed` does disable the card when started, so the following is only necessary if you use bbswitch without bumblebeed.

Set `load_state` and `unload_state` module options according to your needs (see bbswitch documentation).

    /etc/modprobe.d/bbswitch.conf

    options bbswitch load_state=0 unload_state=1

#### Enable NVIDIA card during shutdown

The NVIDIA card may not correctly initialize during boot if the card was powered off when the system was last shutdown. One option is to set `TurnCardOffAtExit=false` in `/etc/bumblebee/bumblebee.conf`, however this will enable the card everytime you stop the Bumblebee daemon, even if done manually. To ensure that the NVIDIA card is always powered on during shutdown, add the following systemd service (if using bbswitch):

    /etc/systemd/system/nvidia-enable.service

    [Unit]
    Description=Enable NVIDIA card
    DefaultDependencies=no

    [Service]
    Type=oneshot
    ExecStart=/bin/sh -c 'echo ON > /proc/acpi/bbswitch'

    [Install]
    WantedBy=shutdown.target

Then enable the service by running `systemctl enable nvidia-enable.service` at the root prompt.

#### Enable NVIDIA card after waking from suspend

The bumblebee daemon may fail to activate the graphics card after suspending. A possible fix involves setting bbswitch as the default method for power management in `/etc/bumblebee/bumblebee.conf`:

    /etc/bumblebee/bumblebee.conf

    [driver-nvidia]
    PMmethod=bbswitch

    # ...

    [driver-nouveau]
    PMmethod=bbswitch

Note: This fix seems to work only after rebooting the system. Restarting the bumblebee service is not enough.

### Multiple monitors

#### Outputs wired to the Intel chip

If the port (DisplayPort/HDMI/VGA) is wired to the Intel chip, you can set up multiple monitors with xorg.conf. Set them to use the Intel card, but Bumblebee can still use the NVIDIA card. One example configuration is below for two identical screens with 1080p resolution and using the HDMI out.

    /etc/X11/xorg.conf

    Section "Screen"
        Identifier     "Screen0"
        Device         "intelgpu0"
        Monitor        "Monitor0"
        DefaultDepth    24
        Option         "TwinView" "0"
        SubSection "Display"
            Depth          24
            Modes          "1980x1080_60.00"
        EndSubSection
    EndSection

    Section "Screen"
        Identifier     "Screen1"
        Device         "intelgpu1"
        Monitor        "Monitor1"
        DefaultDepth   24
        Option         "TwinView" "0"
        SubSection "Display"
            Depth          24
            Modes          "1980x1080_60.00"
        EndSubSection
    EndSection

    Section "Monitor"
        Identifier     "Monitor0"
        Option         "Enable" "true"
    EndSection

    Section "Monitor"
        Identifier     "Monitor1"
        Option         "Enable" "true"
    EndSection

    Section "Device"
        Identifier     "intelgpu0"
        Driver         "intel"
        Option         "XvMC" "true"
        Option         "UseEvents" "true"
        Option         "AccelMethod" "UXA"
        BusID          "PCI:0:2:0"
    EndSection

    Section "Device"
        Identifier     "intelgpu1"
        Driver         "intel"
        Option         "XvMC" "true"
        Option         "UseEvents" "true"
        Option         "AccelMethod" "UXA"
        BusID          "PCI:0:2:0"
    EndSection

    Section "Device"
        Identifier "nvidiagpu1"
        Driver "nvidia"
        BusID "PCI:0:1:0"
    EndSection

You need to probably change the BusID for both the Intel and the NVIDIA card.

    $ lspci | grep VGA

    00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

The BusID is 0:2:0

#### Output wired to the NVIDIA chip

On some notebooks, the digital Video Output (HDMI or DisplayPort) is hardwired to the NVIDIA chip. If you want to use all the displays on such a system simultaneously, you have to run 2 X Servers. The first will be using the Intel driver for the notebooks panel and a display connected on VGA. The second will be started through optirun on the NVIDIA card, and drives the digital display.

intel-virtual-output is a tool provided in the xf86-video-intel driver set, as of v2.99. When run in a terminal, it will daemonize itself unless the `-f` switch is used. Once the tool is running, it activates Bumblebee (Bumblebee can be left as default install), and any displays attached will be automatically detected, and manageable via any desktop display manager such as xrandr or KDE Display. See the Bumblebee wiki page for more information.

Note: In `/etc/bumblebee/xorg.conf.nvidia` change the lines `UseEDID` and `Option "AutoAddDevices" "false"` to `"true"`, if you are having trouble with device resolution detection. You will also need to comment out the line `Option "UseDisplayDevices" "none"` in order to use the display connected to the NVIDIA GPU.

Commandline usage is as follows:

    intel-virtual-output [OPTION]... [TARGET_DISPLAY]...
     -d <source display>  source display
     -f                   keep in foreground (do not detach from console and daemonize)
     -b                   start bumblebee
     -a                   connect to all local displays (e.g. :1, :2, etc)
     -S                   disable use of a singleton and launch a fresh intel-virtual-output process
     -v                   all verbose output, implies -f
     -V <category>        specific verbose output, implies -f
     -h                   this help

If no target displays are parsed on the commandline, intel-virtual-output will attempt to connect to any local display and then start bumblebee.[1]

The advantage of using intel-virtual-output in foreground mode is that once the external display is disconnected, intel-virtual-output can then be killed and bumblebee will disable the nvidia chip. Games can be run on the external screen by first exporting the display `export DISPLAY=:8`, and then running the game with `optirun game_bin`, however, cursor and keyboard are not fully captured. Use `export DISPLAY=:0` to revert back to standard operation.

## Switch between discrete and integrated like Windows

In Windows, the way that Optimus works is NVIDIA has a whitelist of applications that require Optimus for, and you can add applications to this whitelist as needed. When you launch the application, it automatically decides which card to use.

To mimic this behavior in Linux, you can use libgl-switcheroo-gitAUR[broken link: archived in aur-mirror]. After installing, you can add the below in your .xprofile.

    ~/.xprofile

    mkdir -p /tmp/libgl-switcheroo-$USER/fs
    gtkglswitch &
    libgl-switcheroo /tmp/libgl-switcheroo-$USER/fs &

To enable this, you must add the below to the shell that you intend to launch applications from (I simply added it to the .xprofile file)

    export LD_LIBRARY_PATH=/tmp/libgl-switcheroo-$USER/fs/\$LIB${LD_LIBRARY_PATH+:}$LD_LIBRARY_PATH

Once this has all been done, every application you launch from this shell will pop up a GTK+ window asking which card you want to run it with (you can also add an application to the whitelist in the configuration). The configuration is located in `$XDG_CONFIG_HOME/libgl-switcheroo.conf`, usually `~/.config/libgl-switcheroo.conf`

Note: This tool acts by making a FUSE file system and then adding it into the dynamic library searching path, which may lead to slow speed or even segmentation faults when launching a software.

## CUDA without Bumblebee

You can use CUDA without bumblebee. All you need to do is ensure that the nvidia card is on:

     # tee /proc/acpi/bbswitch <<< ON

Now when you start a CUDA application it is going to automatically load all the necessary modules.

To turn off the nvidia card after using CUDA do:

     # rmmod nvidia_uvm
     # rmmod nvidia
     # tee /proc/acpi/bbswitch <<< OFF

## Troubleshooting

Note: Please report bugs at Bumblebee-Project's GitHub tracker as described in its wiki.

### [VGL] ERROR: Could not open display :8

There is a known problem with some wine applications that fork and kill the parent process without keeping track of it (for example the free to play online game "Runes of Magic")

This is a known problem with VirtualGL. As of bumblebee 3.1, so long as you have it installed, you can use Primus as your render bridge:

    $ optirun -b primus wine windows program.exe

If this does not work, an alternative walkaround for this problem is:

    $ optirun bash
    $ optirun wine windows program.exe

If using NVIDIA drivers a fix for this problem is to edit `/etc/bumblebee/xorg.conf.nvidia` and change Option `ConnectedMonitor` to `CRT-0`.

### Xlib: extension "GLX" missing on display ":0.0"

If you tried to install the NVIDIA driver from NVIDIA website, this is not going to work.

1. Uninstall that driver in the similar way:

    # ./NVIDIA-Linux-*.run --uninstall

2. Remove generated by NVIDIA Xorg configuration file:

    # rm /etc/X11/xorg.conf

3. (Re)install the correct NVIDIA driver: #Installing Bumblebee with Intel/NVIDIA

### [ERROR]Cannot access secondary GPU: No devices detected

In some instances, running `optirun` will return:

    [ERROR]Cannot access secondary GPU - error: [XORG] (EE) No devices detected.
    [ERROR]Aborting because fallback start is disabled.

In this case, you will need to move the file `/etc/X11/xorg.conf.d/20-intel.conf` to somewhere else, restart the bumblebeed daemon and it should work. If you do need to change some features for the Intel module, a workaround is to merge `/etc/X11/xorg.conf.d/20-intel.conf` to `/etc/X11/xorg.conf`.

It could be also necessary to comment the driver line in `/etc/X11/xorg.conf.d/10-monitor.conf`.

If you're using the `nouveau` driver you could try switching to the `nvidia` driver.

You might need to define the NVIDIA card somewhere (e.g. file `/etc/X11/xorg.conf.d`), using the correct `BusID` according to `lspci` output:

    Section "Device"
        Identifier "nvidiagpu1"
        Driver "nvidia"
        BusID "PCI:0:1:0"
    EndSection

Observe that the format of `lspci` output is in HEX, while in xorg it is in decimals. So if the output of `lspci` is, for example, `0a:00.0` the `BusID` should be `PCI:10:0:0`.

#### NVIDIA(0): Failed to assign any connected display devices to X screen 0

If the console output is:

    [ERROR]Cannot access secondary GPU - error: [XORG] (EE) NVIDIA(0): Failed to assign any connected display devices to X screen 0
    [ERROR]Aborting because fallback start is disabled.

You can change this line in `/etc/bumblebee/xorg.conf.nvidia`:

    Option "ConnectedMonitor" "DFP"

to:

    Option "ConnectedMonitor" "CRT"

#### Failed to initialize the NVIDIA GPU at PCI:1:0:0 (GPU fallen off the bus / RmInitAdapter failed!)

Add `rcutree.rcu_idle_gp_delay=1` to the kernel parameters of the bootloader configuration (see also the original BBS post for a configuration example).

#### Could not load GPU driver

If the console output is:

    [ERROR]Cannot access secondary GPU - error: Could not load GPU driver

and if you try to load the nvidia module you get:

    modprobe nvidia
    modprobe: ERROR: could not insert 'nvidia': Exec format error

This could be because the nvidia driver is out of sync with the Linux kernel, for example if you installed the latest nvidia driver and haven't updated the kernel in a while. A full system update might resolve the issue. If the problem persists you should try manually compiling the nvidia packages against your current kernel, for example with nvidia-dkms or by compiling nvidia from the ABS.

#### NOUVEAU(0): [drm] failed to set drm interface version

Consider switching to the official nvidia driver. As commented here, nouveau driver has some issues with some cards and bumblebee.

### /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied

This could be worked around by appending following lines in `/etc/bumblebee/xorg.conf.nvidia` (see here):

    Section "Screen"
        Identifier "Default Screen"
        Device "DiscreteNvidia"
    EndSection

### ERROR: ld.so: object 'libdlfaker.so' from LD_PRELOAD cannot be preloaded: ignored

You probably want to start a 32-bit application with bumblebee on a 64-bit system. See the "For 32-bit..." section in #Installation. If the problem persists or if it is a 64-bit application, try using the primus bridge.

### Fatal IO error 11 (Resource temporarily unavailable) on X server

Change `KeepUnusedXServer` in `/etc/bumblebee/bumblebee.conf` from `false` to `true`. Your program forks into background and bumblebee don't know anything about it.

### Video tearing

Video tearing is a somewhat common problem on Bumblebee. To fix it, you need to enable vsync. It should be enabled by default on the Intel card, but verify that from Xorg logs. To check whether or not it is enabled for NVIDIA, run:

    $ optirun nvidia-settings -c :8

`X Server XVideo Settings -> Sync to VBlank` and `OpenGL Settings -> Sync to VBlank` should both be enabled. The Intel card has in general less tearing, so use it for video playback. Especially use VA-API for video decoding (e.g. `mplayer-vaapi` and with `-vsync` parameter).

Refer to the Intel[broken link: invalid section] article on how to fix tearing on the Intel card.

If it is still not fixed, try to disable compositing from your desktop environment. Try also disabling triple buffering.

### Bumblebee cannot connect to socket

You might get something like:

    $ optirun glxspheres64

or (for 32 bit):

    $ optirun glxspheres32

    [ 1648.179533] [ERROR]You've no permission to communicate with the Bumblebee daemon. Try adding yourself to the 'bumblebee' group
    [ 1648.179628] [ERROR]Could not connect to bumblebee daemon - is it running?

If you are already in the `bumblebee` group (`$ groups | grep bumblebee`), you may try removing the socket `/var/run/bumblebeed.socket`.

Another reason for this error could be that you haven't actually turned on both gpu's in your bios, and as a result, the Bumblebee daemon is in fact not running. Check the bios settings carefully and be sure intel graphics (integrated graphics - may be abbreviated in bios as something like igfx) has been enabled or set to auto, and that it's the primary gpu. Your display should be connected to the onboard integrated graphics, not the discrete graphics card.

If you mistakenly had the display connected to the discrete graphics card and intel graphics was disabled, you probably installed Bumblebee after first trying to run Nvidia alone. In this case, be sure to remove the /etc/X11/xorg.conf or .../20-nvidia... configuration files. If Xorg is instructed to use Nvidia in a conf file, X will fail.

### Running X.org from console after login (rootless X.org)

See Xorg#Rootless Xorg (v1.16).

### Primusrun mouse delay/disable VSYNC

For `primusrun`, `VSYNC` is enabled by default and as a result, it could make mouse input delay lag or even slightly decrease performance. Test `primusrun` with `VSYNC` disabled:

    $ vblank_mode=0 primusrun glxgears

This article or section needs language, wiki syntax or style improvements.

Reason: Useless package, equivalent to `alias optiprime="vblank_mode=0 primusrun"`. You can even use `alias primusrun="vblank_mode=0 primusrun"`. (Discuss in Talk:Bumblebee#)

If you want to keep using it, install optiprimeAUR package, which provides a script for above command. Usage:

    $ optiprime glxgears

Comparison:

Command | FPS | Score | Min FPS | Max FPS
--- | --- | --- | --- | ---
optiprime unigine-heaven | 31.5 | 793 | 22.3 | 54.8
primusrun unigine-heaven | 31.4 | 792 | 18.7 | 54.2

Tested with ASUS N550JV laptop and benchmark app unigine-heavenAUR.

Note: To disable vertical synchronization system-wide, see Intel graphics#Disable Vertical Synchronization (VSYNC).

### Primus issues under compositing window managers

Since compositing hurts performance, invoking primus when a compositing WM is active is not recommended.[2] If you need to use primus with compositing and see flickering or bad performance, synchronizing primus' display thread with the application's rendering thread may help:

    $ PRIMUS_SYNC=1 primusrun ...

This makes primus display the previously rendered frame.

### Problems with bumblebee after resuming from standby

In some systems, it can happens that the nvidia module is loaded after resuming from standby. The solution for this, is to install the acpi_call and acpi package.

### Optirun doesn't work, no debug output

Users are reporting that in some cases, even though Bumblebee was installed correctly, running

    $ optirun glxgears -info

gives no output at all, and the glxgears window does not appear. Any programs that need 3d acceleration crashes:

    $ optirun bash
    $ glxgears
    Segmentation fault (core dumped)

Apparently it is a bug of some versions of virtualgl. So a workaround is to install primus and lib32-primus and use it instead:

    $ primusrun glxspheres64
    $ optirun -b primus glxspheres64

By default primus locks the framerate to the vrate of your monitor (usually 60 fps), if needed it can be unlocked by passing the `vblank_mode=0` environment variable.

    $ vblank_mode=0 primusrun glxspheres64

Usually there is no need to display more frames han your monitor can handle, but you might want to for benchmarking or to have faster reactions in games (e.g., if a game need 3 frames to react to a mouse movement with `vblank_mode=0` the reaction will be as quick as your system can handle, without it will always need 1/20 of second).

You might want to edit `/etc/bumblebee/bumblebee.conf` to use the primus render as default. If after an update you want to check if the bug has been fixed just use `optirun -b virtualgl`.

See this forum post for more information.

## See also

- Bumblebee project repository
- Bumblebee project wiki
- Bumblebee project bbswitch repository

Join us at #bumblebee at freenode.net.

Categories:

- Graphics
- X server

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