Bumblebee fails to switch to discrete card

Bumblebee fails to switch to discrete card

I have a laptop with a Intel HD4000 and a nVidia Quadro K2000M. I just
reinstalled Archlinux on my laptop on this morning, so it's a fresh
install.
I graphics drivers that way:
yaourt -S xf86-video-intel intel-dri bumblebee nvidia
I enabled bumblebeed, I even installed bbswitch, I'm stuck to that error:
skypers@ark ~ % optirun glxspheres
[ 815.104395] [ERROR]Cannot access secondary GPU - error: [XORG] (EE)
NVIDIA(0): Failed to initialize the NVIDIA GPU at PCI:1:0:0. Please
[ 815.104447] [ERROR]Aborting because fallback start is disabled.
Here's some info:
skypers@ark ~ % dmesg | tail
[ 662.121696] NVRM: os_pci_init_handle: invalid context!
[ 662.121702] NVRM: GPU at 0000:01:00.0 has fallen off the bus.
[ 662.121705] NVRM: os_pci_init_handle: invalid context!
[ 662.121706] NVRM: os_pci_init_handle: invalid context!
[ 662.153026] NVRM: RmInitAdapter failed! (0x25:0x28:1157)
[ 662.153035] NVRM: rm_init_adapter(0) failed
[ 814.696877] bbswitch: enabling discrete graphics
[ 1366.370707] bbswitch: enabling discrete graphics
[ 1366.370728] nvidia 0000:01:00.0: power state changed by ACPI to D0
[ 1366.380940] nvidia 0000:01:00.0: Refused to change power state,
currently in D3
The Xorg.8 log file. Any idea ?