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$ optirun -vv glxgears
[DEBUG]Reading file: /etc/bumblebee/bumblebee.conf
[INFO]Configured driver: nvidia
[DEBUG]Skipping auto-detection, using configured driver 'nvidia'
[DEBUG]Hiding stderr for execution of /sbin/modinfo
[DEBUG]Process /sbin/modinfo started, PID 5570.
[DEBUG]SIGCHILD received, but wait failed with No child processes
[DEBUG]Active configuration:
[DEBUG] bumblebeed config file: /etc/bumblebee/bumblebee.conf
[DEBUG] X display: :8
[DEBUG] LD_LIBRARY_PATH: /usr/lib/nvidia-bumblebee
[DEBUG] Socket path: /var/run/bumblebee.socket
[DEBUG] VGL Compression: proxy
[DEBUG]optirun version 3.0 starting...
[INFO]Response: No - error: Could not enable discrete graphics card

[ERROR]Cannot access secondary GPU - error: Could not enable discrete graphics card

[DEBUG]Socket closed.
[ERROR]Aborting because fallback start is disabled.
[DEBUG]Killing all remaining processes.

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# 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.
[bumblebeed]
# The secondary Xorg server DISPLAY number
VirtualDisplay=:8
# 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.
KeepUnusedXServer=false
# The name of the Bumbleblee server group name (GID name)
ServerGroup=bumblebee
# Card power state at exit. Set to false if the card shoud be ON when Bumblebee
# server exits.
TurnCardOffAtExit=false
# The default behavior of '-f' option on optirun. If set to "true", '-f' will
# be ignored.
NoEcoModeOverride=false
# 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)
Driver=nvidia

## Client options. Will take effect on the next optirun executed.
[optirun]
# The method used for VirtualGL to transport frames between X servers.
# Possible values are proxy, jpeg, rgb, xv and yuv.
VGLTransport=proxy
# Should the program run under optirun even if Bumblebee server or nvidia card
# is not available?
AllowFallbackToIGC=false


# 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
#             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
[driver-nvidia]
# Module name to load, defaults to Driver if empty or unset
KernelDriver=nvidia
Module=nvidia
PMMethod=bbswitch
# colon-separated path to the nvidia libraries
LibraryPath=/usr/lib/nvidia-bumblebee
# comma-separated path of the directory containing nvidia_drv.so and the
# default Xorg modules path
XorgModulePath=/usr/lib/nvidia-bumblebee/xorg,/usr/lib/xorg/modules
XorgConfFile=/etc/bumblebee/xorg.conf.nvidia

## Section with nouveau driver specific options, only parsed if Driver=nouveau
[driver-nouveau]
KernelDriver=nouveau
PMMethod=bbswitch
XorgConfFile=/etc/bumblebee/xorg.conf.nouveau

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# cat /proc/acpi/bbswitch
0000:01:00.0 OFF

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$ dmesg | grep -C10 bbswitch
bbswitch: version 0.4.2
bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.OVGA
bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEGP.VGA_
bbswitch: detected a nVidia _DSM function
bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
bbswitch: disabling discrete graphics
pci 0000:01:00.0: Refused to change power state, currently in D0
pci 0000:01:00.0: power state changed by ACPI to D3
bbswitch: Result of _DSM call for OFF: 00000000
bbswitch: enabling discrete graphics
bbswitch: Result of _DSM call for ON: 00000000
pci 0000:01:00.0: power state changed by ACPI to D0
pci 0000:01:00.0: Refused to change power state, currently in D3
pci 0000:01:00.0: power state changed by ACPI to D0

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[DEBUG]Reading file: /etc/bumblebee/bumblebee.conf
[INFO]Configured driver: nouveau
[DEBUG]Skipping auto-detection, using configured driver 'nouveau'
[DEBUG]Active configuration:
[DEBUG] bumblebeed config file: /etc/bumblebee/bumblebee.conf
[DEBUG] X display: :8
[DEBUG] LD_LIBRARY_PATH: /usr/lib/nvidia-bumblebee
[DEBUG] Socket path: /var/run/bumblebee.socket
[DEBUG] VGL Compression: proxy
[DEBUG]optirun version 3.0 starting...
[INFO]Response: No - error: Could not enable discrete graphics card

[ERROR]Cannot access secondary GPU - error: Could not enable discrete graphics card

[DEBUG]Socket closed.
[ERROR]Aborting because fallback start is disabled.
[DEBUG]Killing all remaining processes.