Thank you. I agree, it has probably something to do with my old laptop.

In the meantime I have checked the camera connected to a Raspberry Pi 3 (USB 2.0) running Mate and the same KStars build. The cooling works fine. Any temperature can be adjusted and i reached in a few minutes (however, the Raspberry crashes when running sequences when I use it in the field, thats why I switched to my old laptop).

Thanks again for your help.

Clear skies

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