It needs for watching a video or restful sleep maybe something else.

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put on hold as unclear what you're asking by RockPaperLizard Aug 15 at 8:35

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  • Set the screen saver to an image which is all black & activate it? – Mawg Aug 14 at 7:13
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    @Mawg if its only "black image", its need to be activated by appropriate software with minimalistic UI. Note: something needs to going on other display at the same time and classical "screen saver" is not suitable. – ArcherGodson Aug 14 at 11:09