Can't write to file /sys/class/backlight/acpi_video0/brightness (ubuntu)

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Music by Eric Matyas
https://www.soundimage.org
Track title: Puzzle Game 3 Looping

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Chapters
00:00 Question
00:36 Accepted answer (Score 23)
01:21 Answer 2 (Score 23)
02:11 Answer 3 (Score 2)
02:26 Answer 4 (Score 0)
02:47 Thank you

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Full question
https://superuser.com/questions/484678/c...

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Tags
#linux #sudo #brightness #su

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