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I have a "Inspirion 15r SE 7520" and the Brightness control doesn't work. Using amd driver, I have already added:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

to the grub config file but with this line, my Ubuntu doesn't start.

What I have to do?

Using AMD RADEON HD7700M SERIES and my notebook have Hybrid graphics.

user.dz
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user284626
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1 Answers1

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I have downloaded this for nvidia geforce Adjust backlight of Compaq Armada laptops (E300, M500, M700) Change LCD brightness on GeForce cards

and updated my grub file with 

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video.use_native_backlight=1"

I got it working.... :-)

Aravind Vemula
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