Cannot make Bumblebee (systemd-logind failed)

Question

I had bought an Dell Inspiron 14 notebook and now I'm now I'm trying to use Arch Linux, but I can't make the graphic interfaces work.
I'm getting continuosly this error,
[ERROR]Cannot access secondary GPU - error: [XORG] (EE) systemd-logind: failed to get session: PID XXX does not belong to any known session
[ERROR]Aborting because fallback start is disabled.
when I use
primusrun glxspheres64
, I had already put
MODULES="i915 bbswitch" to my /etc/mkinitcpio.conf
My bootloader is Grub and I already had append
rcutree.rcu_idle_gp_delay=1
to it.
Outside then I hadn't touch any other bumblebee configuration.
Other informations that maybe are relevant: I'm trying to use bumblebee with the nvidia driver.
Thanks for reading that and sorry for bad english.

Answer 1

Got very similar problem, with "fresh" install on Lenovo G50 laptop: Intel and Ati cards. I noticed using sftp transfer or conky's curl I am logged out from my session back to lightdm.
From dmesg:
[ 966.843057] Chrome_ChildThr[1348]: segfault at 0 ip 00007f88d9d36391 sp 00007f88c5a8d500 error 6 in libmozalloc.so[7f88d9d35000+2000]
and Xorg.log
[ 1209.395] (EE) systemd-logind: failed to get session: PID 1955 does not belong to any known session
[ 1209.398] (EE) Failed to load module "modesetting" (module does not exist, 0)
[ 1209.398] (EE) Failed to load module "fbdev" (module does not exist, 0)
[ 1209.398] (EE) Failed to load module "vesa" (module does not exist, 0)
Is it something similar to this bug? Anything else seems to work OK.