Some issues about bumblebee and NVIDIA support

[Asuka Aria]

Hi Maintainer,
I have some problem with bumblebee. When I run `optirun <program>`, I got
the error
[ERROR]Cannot access secondary GPU - error: [XORG] (EE) /dev/dri/card0:
failed to set DRM interface version 1.4: Permission denied
[ERROR]Aborting because fallback start is disabled.

-- System information
Debian Release: jessie
Architecture: amd64 (x86_64)
$ uname -a
Linux host 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-3-deb8u1 (2015-04-24)
x86_64 GNU/Linux

-- Packages version
Bumblebee: 3.2.1-7
Primus: 0~20140711-1
xerserver-xorg-video-nouveau: 1:1.0.11-1

-- Graphics
Using Inter HD 4600 and Nvidia GTX 950M with i7 4720HQ.

$ lspci | egrep 'VGA|3D'
00:02.0 VGA compatible controller: Inter Corporation 4th Gen Core Processor
Integrated Graphics Controller (rev 06)
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 950M] (rev a2)

I have trie to install the driver from `aptitude install nvidia-driver`,
but after I could not get into the system. At first, I installed the
"bumblebee-nvidia" package, but I also get the ERROR mentioned above.Attach
my /var/log/Xorg.8.log.

What could I do?

Thanks a lot!!!

Asuka
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