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[Launchpad Bug Tracker <1449560@xxxxxxxxxxxxxxxxxx>]

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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.

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete

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Cannot login with Nvidia Optimus hardware installed(Ubuntu 15.04)
https://bugs.launchpad.net/bugs/1449560
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