Il 24.07.2014 07:15 Ulrich Pegelow ha scritto:
> You are lacking libOpenCL.so which should be a symbolic link to
> libOpenCL.so.1. We had a similar issue before.
> 
> Normally this link gets generated during installation of the driver by
> automatically calling ldconfig. You may either
> 
> * call ldconfig as root (preferred option)
> * generate the link manually
> 

Same problem here, but ldconfig did not help to generate the symlink. 
Output from root user:

# find / -name 'libOpenCL.so'
#
# ldconfig
# find / -name 'libOpenCL.so'
#

It seems that it should be included in this package:

$ apt-file search libOpenCL.so | grep nvidia
nvidia-libopencl1: /usr/lib/x86_64-linux-gnu/libOpenCL.so
nvidia-libopencl1: /usr/lib/x86_64-linux-gnu/libOpenCL.so.1
nvidia-libopencl1: /usr/lib/x86_64-linux-gnu/libOpenCL.so.1.0.0
nvidia-opencl-dev: /usr/lib/x86_64-linux-gnu/libOpenCL.so

But it's actually just in nvidia-opencl-dev:
https://packages.debian.org/sid/amd64/nvidia-opencl-dev/filelist
https://packages.debian.org/sid/amd64/nvidia-libopencl1/filelist

Now I've installed the -dev package and I got the symlink:

$ ls -l /usr/lib/x86_64-linux-gnu/libOpenCL.so
lrwxrwxrwx 1 root root 14 mag 25 01:36 
/usr/lib/x86_64-linux-gnu/libOpenCL.so -> libOpenCL.so.1

However, darktable can't use opencl:

[opencl_init] trying to load opencl library: '<system default>'
[opencl_init] opencl library 'libOpenCL' found on your system and loaded
[opencl_init] could not get platforms: -1001
[opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
[opencl_init] initial status of opencl enabled flag is OFF.

I'm on debian sid. I've reported the problem here weeks ago:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746643

$ cat /proc/driver/nvidia/version
NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.24  Wed Jul  2 
14:24:20 PDT 2014
GCC version:  gcc version 4.8.3 (Debian 4.8.3-4)




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