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[Bug 1462221] Re: Display Brightness Cannot be Changed

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: BadBone2k <1462221@xxxxxxxxxxxxxxxxxx>
Date: Sun, 26 Jul 2015 20:06:09 -0000
Reply-to: Bug 1462221 <1462221@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Found a workaround for my Toshiba Tecra A11:
http://ubuntuforums.org/showthread.php?t=2275437&p=13272746#post13272746

TL;DR
edit /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor"

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https://bugs.launchpad.net/bugs/1462221

Title:
  Display Brightness Cannot be Changed

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I am using HP Probook 450 G0...It uses dicrete graphics (Intel GMA +
  AMD Radeon). I installed UbuntuMATE (DEsktop Env version 1.8.1). Under
  power management preferences the screen brightness cannot be changed
  no matter what value you set on the slider.

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