Running it directly from the terminal with -d opencl appears to start 
without any error messages and  running with the same extension from a 
normal icon is also running correctly and shows the opencl box checked 
in the preferences list. ..... thanks ... I guess it is working 
correctly :=))

David

On 12-12-18 01:02 PM, Ulrich Pegelow wrote:
> Am 18.12.2012 21:31, schrieb David Vincent-Jones:
>> After installing bumblebee on my Nvidia-Optimus  graphics system I ran
>> "optirun darktable -d opencl" ..... after which I was able to check the
>> opencl box in the setup preferences.
>>
>> Can I now infer that opencl is correctly running on the system?
>>
> David,
>
> you can start darktable from a terminal with -d opencl and have a look
> at its output. If something goes wrong you would see a lot of error
> messages (typically error numbers -4, -5 and -6) at run-time and
> statements that darktable falls back to cpu. Occasional fallbacks to cpu
> are OK. Sometimes darktable detects that it should better run on cpu
> than gpu.
>
> Ulrich
>
>
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