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The brightness hotkeys have no effect in Ubuntu 16.04. My laptop is an ASUS G752VL-DH71. I'm running proprietary graphics card drivers (after enabling, I could at least toggle brightness manually.) The graphics card is an nvidia geforce gtx 965m.

I tried the update suggested here without any success.

Some other hotkeys (volume) work.

Any suggestions?

Edit: now the brightness control doesn't work through system settings either, regardless of gfx driver.

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I had the same problem but updated to kernel 4.12 and most of the problems went away. I followed the instructions suggested here.

Don't forget to update grub after the kernel installation and before reboot with

sudo update-grub

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