Hello MarcoLuglio, thanks for joining the Intel Community.
Please check the following thread, post #5 from Robert_U. Re: Fix Display Power Saving Technology
It is important to mention that Apple has requested us, that all questions regarding Apple systems and software be addressed directly with Apple support. I recommend checking the link below for troubleshooting assistance on your Apple computer:
Hi Sylvia, I forgot to mention that I've looked in the forums for people having similar problems. That's how I found that my control panel does not show the option to disable the display power saving technology. I've already seen the thread you linked to. But it's related to using a notebook with a battery or with ac power supply. That's not what I'm experiencing. There is no way to use a mac mini with a battery.
The thread that made me find about the missing option was this one: How to turn off "intel display power saving technology"
Well, I'll get in contact with apple support then. Thanks.