Hello,

spent again some time on Nvidia versions to get opencl 
working again (partly).



nvidia-304-updates: 
--------------------
opencl detected, kernels compiled except blendop 

leads to the known fallback to cpu with long processing time:
[dev_pixelpipe] took 77,193 secs (254,325 CPU) processed `denoise
(profiled)  ' on CPU with tiling, blended on CPU [export]




nvidia-331 NOGO (checked: normal/updates, uvm)
--------------------
darktable-cltest:    -1001



for-the-file: 
i searched mailinglist, google. 
not very helpful except using newer nvidia blobs, some tips for uvm and symlink:
/opt/darktable/lib/darktable/libOpenCL.so -> 
/usr/lib/x86_64-linux-gnu/libOpenCL.so.1.0.0

dt from git
GeForce GTX 660


ubuntu 14.04 LTS too old?
what distribution / nvidia combination is working?
f21 is in the wild...



i would not like to install driver package from nvidia itself, screwed up my 
system in the past. dependency hell. iirc
the 'Additional Drivers' should be the only thing to fiddle system settings. 



kind regards
Wolfgang

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