How to stop my second monitor from dimming (connected on a mbp)?

Hello
I have a MBP 13" late 2011, I have a second monitor connected to it (LG 24EN43VS), and it doesn't stop from dimming. For me it seems that as soon as I have movements in the second screen it dims, then come back full brightness, but it's annoying I feel like having a stroboscope lol.
Thanks for helping.
PS: I even did a fresh install of Yosemite + Reset SMC & RPAM

I would also very much like to know this.Multiscreen as default is less convenient for me. Please advice on how to disable this M

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