NVIDIA GeForce GTX 960M with Optimus on Arch Linux

etc_bumblebee_bumblebee.conf

#/etc/bumblebee/bumblebee.conf

[bumblebeed]
VirtualDisplay=:8
KeepUnusedXServer=false
ServerGroup=bumblebee
TurnCardOffAtExit=false
NoEcoModeOverride=false
Driver=nvidia
XorgConfDir=/etc/bumblebee/xorg.conf.d

[optirun]
Bridge=auto
VGLTransport=proxy
PrimusLibraryPath=/usr/lib/primus:/usr/lib32/primus
AllowFallbackToIGC=false

[driver-nvidia]
KernelDriver=nvidia
PMMethod=auto
LibraryPath=/usr/lib/nvidia:/usr/lib32/nvidia
XorgModulePath=/usr/lib/nvidia/xorg/,/usr/lib/xorg/modules
XorgConfFile=/etc/bumblebee/xorg.conf.nvidia

etc_bumblebee_xorg.conf.nvidia

#/etc/bumblebee/xorg.conf.nvidia

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

Section "Device"
	Identifier "DiscreteNvidia"
	Driver "nvidia"
	VendorName "NVIDIA Corporation"
	BusID "PCI:1:0:0"
	Option "ProbeAllGpus" "false"
	Option "NoLogo" "true"
	Option "UseEDID" "false"
	Option "UseDisplayDevice" "none"
EndSection

etc_X11_xorg.conf

#/etc/X11/xorg.conf

Section "ServerLayout"
	Identifier "layout"
	Screen 0 "intel"
	Inactive "nvidia"
EndSection

Section "Device"
	Identifier "intel"
	Driver "intel"
	BusID "PCI:0:2:0"
	Option "AccelMethod" "sna"
EndSection

Section "Screen"
	Identifier "intel"
	Device "intel"
EndSection

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

Section "Screen"
	Identifier "nvidia"
	Device "nvidia"
	Option "AllowEmptyInitialConfiguration" "Yes"
EndSection

NVIDIA_GeForce_GTX_960M_with_Optimus_on_Arch_Linux.rst

Packages

• bumblebee 3.2.1-10 (provides nvidia-libgl)
• mesa 11.0.4-1
• mesa-libgl 11.0.4-1
• nvidia 355.11-4 (Nvidia driver)
• primus 20150118-2 (Bumblebee bridge)
• xf86-video-intel 1:2.99.917+478+gdf72bc5-2 (Intel driver)
• xorg-server 1.17.3-1 (xorg)
• xorg-xrandr 1.4.3-1

"There's nvidia-xconfig utility, installed with Bumblebee among NVIDIA tools. Never run it on Optimus computers. It was designed for and works correctly on single-GPU NVIDIA cards only. It doesn't detect hybrid NVIDIA Optimus cards. It's a perfect Bumblebee killer. If executed, it immediately breaks Bumblebee configuration." - url

I've been trying to get this working for several hours now and it doesn't seem to work out. glxgears as well as optirun glxgears keep throwing an XORG error No device detected..

After installation and updating config files you probaly need enable bumblebee service and add user to bumblebee group:

sudo gpasswd -a YourUserName bumblebee
sudo systemctl enable bumblebeed.service

Also - to auto disabe discrete card need install bbswitch package. More info in archwiki.
Then reboot...

To check - is dicrete card used: optirun --status

Bumblebee status: Ready (3.2.1). X is PID 945, 2 applications using bumblebeed.
or
Bumblebee status: Ready (3.2.1). X inactive. Discrete video card is off. (if here on - means bbswitch not installed/work)

Thanks, this took much longer then it should have.

After doing this, the fans just go crazy starting X.

Everything works smoothly, but the fans starts screaming like if they were an air-plane.

Do you know how to solve it?

One thing I did not see is the Bumblebeed status:

● bumblebeed.service - Bumblebee C Daemon
   Loaded: loaded (/usr/lib/systemd/system/bumblebeed.service; enabled; vendor preset: disabled)
   Active: active (running) since Wed 2017-06-21 10:01:43 -05; 4min 6s ago
 Main PID: 419 (bumblebeed)
    Tasks: 1 (limit: 4915)
   CGroup: /system.slice/bumblebeed.service
           └─419 /usr/bin/bumblebeed

jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351298] [WARN][XORG] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351301] [WARN][XORG] (WW) Warning, couldn't open module mouse
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351307] [ERROR][XORG] (EE) No devices detected.
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351309] [ERROR][XORG] (EE)
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351311] [ERROR][XORG] (EE) no screens found(EE)
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351313] [ERROR][XORG] (EE)
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351315] [ERROR][XORG] (EE) Please also check the log file at "/var/log/Xorg.8.log" for additional information.
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351317] [ERROR][XORG] (EE)
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.351318] [ERROR][XORG] (EE) Server terminated with error (1). Closing log file.
jun 21 10:05:27 rog-csampedro bumblebeed[419]: [  240.370313] [ERROR]X did not start properly

@camilosampedro -> no screens found. I think you need configure xorg, screen sections.

@camilosampedro I have the same problem, did you manage to solve it?