Public bug reported:

Using Kubuntu 14.10 64bits
==========
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu Utopic Unicorn (development branch)
Release:        14.10
Codename:       utopic
==========
$ sudo dpkg -l | grep -i nvidia
ii  bbswitch-dkms                         0.7-2ubuntu1                          
   amd64        Interface for toggling the power on nVidia Optimus video cards
ii  libcuda1-331-updates                  331.89-0ubuntu5                       
   amd64        NVIDIA CUDA runtime library
ii  nvidia-331-updates                    331.89-0ubuntu5                       
   amd64        NVIDIA binary driver - version 331.89
ii  nvidia-331-updates-uvm                331.89-0ubuntu5                       
   amd64        NVIDIA Unified Memory kernel module
ii  nvidia-opencl-icd-331-updates         331.89-0ubuntu5                       
   amd64        NVIDIA OpenCL ICD
ii  nvidia-prime                          0.6.6                                 
   amd64        Tools to enable NVIDIA's Prime
ii  nvidia-settings                       331.20-0ubuntu8                       
   amd64        Tool for configuring the NVIDIA graphics driver
==========
$ lsmod | grep nvi
nvidia              10728519  40 
drm                   310919  3 nvidia
========================================

I am using the Blender 3D 2.71 binary downloaded from the official Blender 
site. It contain precompiled CUDA Kernel (cuda toolkit is not required to be 
installed). If I run Blender then CUDA is not available under "File > User 
Preferences > System > Compute Device" . If I run as super user Blender 
(kdesudo ./blender), then CUDA is available.
Here's a related thread on nvidia devtalk forum (see message #8):

https://devtalk.nvidia.com/default/topic/699610/334-21-driver-
returns-999-on-cuinit-cuda-/

** Affects: nvidia-graphics-drivers-331-updates (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 3d blender cuda nvidia

** Attachment added: "Xorg.0.log"
   https://bugs.launchpad.net/bugs/1375841/+attachment/4220380/+files/Xorg.0.log

** Summary changed:

- [nvidia-331-updates] CUDA only works as root
+ [nvidia-331-updates] [14.10 Utopic] CUDA only works as root

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https://bugs.launchpad.net/bugs/1375841

Title:
  [nvidia-331-updates] [14.10 Utopic] CUDA only works as root

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