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[Rene Greuel <1449560@xxxxxxxxxxxxxxxxxx>]

Additional info:

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu Wily Werewolf (development branch)
Release:	15.10
Codename:	wily

$ uname -r
4.2.0-7-generic

$ sudo apt-cache policy nvidia-352
nvidia-352:
  Installiert:           352.30-0ubuntu1
  Installationskandidat: 352.30-0ubuntu1
  Versionstabelle:
 *** 352.30-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ wily/restricted amd64 Packages
        100 /var/lib/dpkg/status

$ sudo apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
  Installiert:           2:2.99.917+git20150808-0ubuntu2
  Installationskandidat: 2:2.99.917+git20150808-0ubuntu2
  Versionstabelle:
 *** 2:2.99.917+git20150808-0ubuntu2 0
        500 http://de.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
        100 /var/lib/dpkg/status

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1449560

Title:
  Cannot login with Nvidia Optimus hardware installed(Ubuntu 15.04)

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  I have Nvidia Optimus GT415M hardware on my laptop.

  I've upgraded my Ubuntu 14.10 where everything was working fine with
  Nvidia Optimus  to Ubuntu 15.04 and now I cannot login. After I type
  the password login screen comes back again.

  I did complete reinstall of NVidia packages and installed new
  nvidia-346 package from Ubuntu repo.

  Looking at Xorg.0.log I see this message:
  [   120.353] (EE) intel(G1): [drm] failed to set drm interface version: Permission denied [13].
  [   120.353] (II) intel(G1): [drm] Contents of '/sys/kernel/debug/dri/0/clients':
  [   120.353] (II) intel(G1): [drm] a dev	pid    uid	magic
  [   120.354] (II) intel(G1): [drm] 
  [   120.354] (II) intel(G1): [drm] y   0  2996     0          0
  [   120.354] (II) intel(G1): [drm] y   0  2996     0          0
  [   120.354] (EE) intel(G1): Failed to claim DRM device.

  And I have found thread regarding this problem on
  https://devtalk.nvidia.com/default/topic/816599/prime-switching-to-
  nvidia-creates-black-screen/. So looks like hardware similar to mine
  need a new version of xserver-xorg-video-intel.

  Could you please help with this.

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