You don't need to uncheck the box. If the setting is greyed out then 
darktable does not use OpenCL because darktable has not found a running 
OpenCL environment on your system. Anyhow the Intel-GPU OpenCL system is 
still very shaky. AFAIK there has been no success report on using it 
with darktable yet.

Ulrich

Am 28.04.2015 um 13:08 schrieb Francisco Cribari:
> I am running Darktable on a notebook that has an Intel GPU. How can I
> uncheck the "activate OpenCL support" option?
>
>  From the DT manual: "darktable can use your GPU to speed up processing
> significantly. Interface OpenCL requires suitable hardware and matching
> OpenCL drivers on your system. If one of those is not found the option
> is greyed out. Can be switched on and off at any time and takes
> immediate effect (default on)."
>
> I am confused because the option is indeed greyed out but the
> corresponding box is checked.  See
>
> https://dl.dropboxusercontent.com/u/2171814/darktable-opencl-1.png
>
> FC
>

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