Surely there is a way to do this? What a useless feature. I have tried unchecking "Dim screen to save power" in Brightness and Lock settings but it did not do anything.
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Caveat Emptor... I'm the author of the proposed solution. When you plug in or unplug your AC adapter a one time udev event is triggered and then Ubuntu brigntens or dims your screen. Most posts here are complaints about the screen not dimming on battery power. Your complaint however is the opposite.
This application will automatically set your screen brightness based on internet specified sunrise and sunset: Automatically adjust display brightness based on sunrise and sunset. Additionally you define a transition period for dawn and dusk (usually about 90 minutes).
There are already some "under the hood" hooks into systemd to react after suspend/resume for instantaneous/transparent screen brightness reset. Another script can be provided to respond within a millisecond when AC is plugged/unplugged instead of waiting 1 to 59 seconds for your screen brightness to return to optimal setting. Testing and feedback will be required from yourself as my own display doesn't change when AC is plugged/unplugged and I can't duplicate your "complaint". As Is though the proposed solution should work to solve your problem with an average 30 second wait period for your screen brightness to return to "normal".
WinEunuuchs2Unix
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It does not make much sense to me to create a feature without giving users the freedom to disable it. My laptop behaves really strangely that it is super frustrating to see. Even after I increased the brightness manually, it turned down to minimum brightness right away. – jaycode Aug 27 '17 at 17:06
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I don't want additional bash or cron script or whatever man, I just want to disable the feature, is it not possible to do so? Thank you for replying to my rampant by the way, really appreciate it. – jaycode Aug 27 '17 at 17:07