I upgraded to ubuntu 17.10 and display brightness controller is working the Primary display, but it is not working Secondary display (External display).
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1check this link Can I control brightness on second monitor? – amir.m ghazanfari Dec 21 '17 at 16:35
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This way do not work correctly. The secondary monitor can't response. – Spn khn Jan 03 '18 at 02:53