Brightness settings don't change anything

Bug #1280958 reported by Enkouyami on 2014-02-17
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Linux Mint

Bug Description

Attempting to change the brightness settings using CLI tools, the brightness up/down keys on a keyboard, and the stock cinnamon brightness applet, all do nothing. This is also an issue for Ubuntu.

It used to work in LM15 without changing any files.

In have an Inspiron 14R laptop that has an intel backlight.

Enkouyami (furyhamster) on 2014-02-18
description: updated
Enkouyami (furyhamster) on 2014-09-02
no longer affects: ubiquity
description: updated
description: updated
Enkouyami (furyhamster) wrote :

To fix this in Linux Mint 16 and Ubuntu 13.10, one needs to add the 'acpi_backlight=vendor' to the 'GRUB_CMDLINE_LINUX_DEFAULT=' in the '/etc/default/grub' file, running 'sudo update-grub', and then restart the computer.

For Linux Mint 17 and Ubuntu 14.10, this is fixed by creating/editing the /usr/share/X11/xorg.conf.d/20-intel.conf file and entering the following inside:
Section "Device
        Identifier "card0"
        Driver "intel"
        Option "Backlight" "intel_backlight"
        BusID "PCI:0:2:0"EndSection

Stuff like this should already have been done in the ubiquity installer.

Enkouyami (furyhamster) wrote :

This is basically what can be ran by somewhere during the installation process to fix this issue.

Enkouyami (furyhamster) wrote :
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