bumblebeed: No integrated video card found, quitting

I'm trying to get Bumblebee working on Ubuntu 14.10 x64 and NVIDIA OPTIMUS:
- Intel HD3000 (don't know which drivers are used: I've installed Intel(R) Graphics Installer for Linux* 1.0.7 while being on 14.04 and then upgraded to 14.10)
- NVIDIA GT555M with 331.113 driver

~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF106M [GeForce GT 555M] (rev a1)

~$ optirun --status
[  793.908226] [ERROR]The Bumblebee daemon has not been started yet or the socket path /var/run/bumblebee.socket was incorrect.
[  793.908349] [ERROR]Could not connect to bumblebee daemon - is it running?

~$ bumblebeed
[  842.118430] [ERROR]No integrated video card found, quitting.

^ How can I fix that?