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[Hannu N <_garbage_collector_@xxxxxxxxx>]

I think this is something that is unrelated to nvidia and/or darktable -
I had updates of "lib-mesa" on 2014-07-10 (Thursday) and believe I
didn't run darktable much yesterday (Friday).

It seems as darktable at least gets a bit further, with "opencl_library
=libnvidia-opencl.so.1" in "~/.config/darktable/darktablerc"

$ darktable -d opencl
[opencl_init] opencl related configuration options:
[opencl_init] 
[opencl_init] opencl: 1
[opencl_init] opencl_library: 'libnvidia-opencl.so.1'
[opencl_init] opencl_memory_requirement: 768
[opencl_init] opencl_memory_headroom: 300
[opencl_init] opencl_device_priority: '*/!0,*/*/*'
[opencl_init] opencl_size_roundup: 16
[opencl_init] opencl_async_pixelpipe: 0
[opencl_init] opencl_synch_cache: 0
[opencl_init] opencl_number_event_handles: 25
[opencl_init] opencl_micro_nap: 1000
[opencl_init] opencl_use_pinned_memory: 0
[opencl_init] opencl_use_cpu_devices: 0
[opencl_init] opencl_avoid_atomics: 0
[opencl_init] opencl_omit_whitebalance: 0
[opencl_init] 
[opencl_init] trying to load opencl library: 'libnvidia-opencl.so.1'
[opencl_init] could not load all required symbols from library
[opencl_init] no working opencl library found. Continue with opencl disabled
[opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
[opencl_init] initial status of opencl enabled flag is OFF.

...

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1311362

Title:
  Ubuntu Gnome 14.04 - NVidia 331 - OpenCL broken (using Darktable)

Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  ** Steps to Reproduce: **
  1. Perform a fresh installation of Ubuntu Gnome 14.04 64-bit on a clean PC
  2. Using the "Additional Drivers" application, install latest NVidia driver (331)
  3. Reboot
  4. Install latest Darktable (1.4) from Ubuntu's repositories
  5. In Terminal, run "darktable -d opencl"

  ** Actual Result: **
  In Ubuntu Gnome 14.04, using the NVidia 331 driver, Darktable won't run with OpenCL support. The following debug output is observed in the terminal:

  [opencl_init] opencl related configuration options:
  [opencl_init]
  [opencl_init] opencl: 1
  [opencl_init] opencl_library: ''
  [opencl_init] opencl_memory_requirement: 768
  [opencl_init] opencl_memory_headroom: 300
  [opencl_init] opencl_device_priority: '*/!0,*/*/*'
  [opencl_init] opencl_size_roundup: 16
  [opencl_init] opencl_async_pixelpipe: 0
  [opencl_init] opencl_synch_cache: 0
  [opencl_init] opencl_number_event_handles: 25
  [opencl_init] opencl_micro_nap: 1000
  [opencl_init] opencl_use_pinned_memory: 0
  [opencl_init] opencl_use_cpu_devices: 0
  [opencl_init] opencl_avoid_atomics: 0
  [opencl_init] opencl_omit_whitebalance: 0
  [opencl_init]
  [opencl_init] trying to load opencl library: '<system default>'
  [opencl_init] could not find opencl runtime library 'libOpenCL'
  [opencl_init] no working opencl library found. Continue with opencl disabled
  [opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
  [opencl_init] initial status of opencl enabled flag is OFF.
  [pixelpipe_process] [thumbnail] using device -1
  [pixelpipe_process] [thumbnail] using device -1

  ** Expected Result: **
  Software using OpenCL should continue to work as it did in Ubuntu 13.10.

  ** Notes: **
  Graphics card: GeForce GTX 680 (Gigabyte GV-N680OC-2GD)
  Encuontered on Ubuntu Gnome 14.04, 64 bit.
  Likely occurs on regular Ubuntu (not Ubuntu Gnome) as well.
  This issue also occurs when running NVidia 331 Update, NVidia Legacy 304 as well as Nouveau.
  This issue did not occur on Ubuntu Gnome 13.10.
  Bug filed in Darktable: http://www.darktable.org/redmine/issues/9913#change-24936

  ** Troubleshooting: **
  The following files and directories relating to OpenCL were found on the test system:

  locate -i libopencl
  /usr/lib/i386-linux-gnu/libOpenCL.so.1
  /usr/lib/i386-linux-gnu/libOpenCL.so.1.0
  /usr/lib/i386-linux-gnu/libOpenCL.so.1.0.0
  /usr/lib/x86_64-linux-gnu/libOpenCL.so.1
  /usr/lib/x86_64-linux-gnu/libOpenCL.so.1.0
  /usr/lib/x86_64-linux-gnu/libOpenCL.so.1.0.0
  /usr/share/doc/nvidia-libopencl1-331
  /usr/share/doc/nvidia-libopencl1-331/changelog.Debian.gz
  /usr/share/doc/nvidia-libopencl1-331/copyright
  /var/cache/apt/archives/nvidia-libopencl1-331_331.38-0ubuntu7_amd64.deb
  /var/lib/dpkg/info/nvidia-libopencl1-331.list
  /var/lib/dpkg/info/nvidia-libopencl1-331.md5sums
  /var/lib/dpkg/info/nvidia-libopencl1-331.postinst
  /var/lib/dpkg/info/nvidia-libopencl1-331.postrm
  /var/lib/dpkg/info/nvidia-libopencl1-331.shlibs

  installed the packages "opencl-headers" and "nvidia-profiler", but that made no difference.
  Manually edited /etc/ld.so.conf to include the directories found containing the OpenCL libraries (from the list above). Ran ldconfig. No difference.

  Output of clinfo:

  clinfo: /usr/lib/x86_64-linux-gnu/libOpenCL.so.1: no version information available (required by clinfo)
  E: -30

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.38  Wed Jan  8 19:32:30 PST 2014
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Tue Apr 22 17:59:29 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.13.0-24-generic, x86_64: installed
   nvidia-331-updates, 331.38, 3.13.0-24-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   NVIDIA Corporation GK104 [GeForce GTX 680] [10de:1180] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Device [1458:353c]
  InstallationDate: Installed on 2014-04-20 (2 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=c651e8be-8145-4f89-9f68-919286e646bb ro quiet splash
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/20/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080015
  dmi.board.name: JW-A870T-UC3
  dmi.board.vendor: JW Technology
  dmi.board.version: V1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080015:bd05/20/2010:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnJWTechnology:rnJW-A870T-UC3:rvrV1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Tue Apr 22 17:30:17 2014
  xserver.configfile: default
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.15.1-0ubuntu2

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