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I recently re-installed Ubuntu on my MSI GP62 laptop. However, I cannot change the brightness. I have tried many things, including booting with acpi_backlight=vendor and similar combinations.

It should be noted that the output of

ls /sys/class/backlight

is empty. Perhaps as a result, xbacklight and other applications do not work. I am also using the Intel drivers/nouveau. I tried various versions of the Nvidia drivers, but they all result in a login loop, similar to this: Ubuntu 16 Stuck in Login Loop after Installing Nvidia 364 Drivers.

Output of lspci -vnn |grep VGA:

00:02.0 VGA compatible controller [0300]: Intel Corporation Skylake Integrated Graphics [8086:191b] (rev 06) (prog-if 00 [VGA controller])

I am also using the nomodeset kernel parameter - without it I cannot get to the login screen.

Any help would be greatly appreciated!

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The only solution that worked was downgrading to Ubuntu 14.04

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I've a MSI GT62VR with the NVIDIA (375) drivers and brightness working fine in Ubuntu 16.04. I followed the instructions in Step 1 in this link: http://www.castoriscausa.com/posts/ge62vr-mint-gtx1060

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