[Bug 568611] Re: Screen brightness control fails on Dell Studio 1558, Lenovo Ideapad Z360

[Hendy Irawan]

To always add acpi_backlight=vendor to your kernel, edit the
/etc/default/grub file by running:

gksu gedit /etc/default/grub

and edit the following line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

into:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Save, and run:

sudo update-grub

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Screen brightness control fails on Dell Studio 1558, Lenovo Ideapad Z360
https://bugs.launchpad.net/bugs/568611
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