Why is it possible to flip the screen?

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Chapters
00:00 Question
00:41 Accepted answer (Score 95)
01:21 Answer 2 (Score 44)
01:53 Answer 3 (Score 42)
02:36 Answer 4 (Score 19)
03:13 Thank you

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Full question
https://superuser.com/questions/1382056/...

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Tags
#linux #ubuntu #display

#avk47