Solution for problem number: #1516213 

Lowering the brightness turns the monitor black in ubuntu 14.04

Step 1: Go to Terminal and type the following command. “sudo gedit
/etc/default/grub”

Step 2: A New window opens up with the following content.
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash”.

Step 3:  Change the content into GRUB_CMDLINE_LINUX_DEFAULT=”quiet
splash acpi_backlight=vendor”. Save the file and close the window.

Step 4: Open the terminal again and type “sudo update-grub”. This will
update the grub and once the computer is rebooted, the problem of
adjusting the brightness will be solved.

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https://bugs.launchpad.net/bugs/1516213

Title:
  Lowering  the brightness turns the monitor black in ubuntu 14.04

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