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.
** Also affects: ubuntu
Importance: Undecided
Status: New
** Also affects: ubiquity
Importance: Undecided
Status: New
** No longer affects: ubiquity
** Description changed:
- On my Laptop, an Inspiron 14R that uses the EUFI firmware, my brightness
- settings and the brightness up/down keys do nothing. This is normally
- fixed by adding the line "GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"" to
- /etc/default/grub, running "update-grub", then restart my computer, but
- that didn't work anymore.
+ 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.
- When I installed Linux Mint 16 Cinnamon 64bit on my laptop selected the
- option to encrypt my partition with LUKS, the above fix doesn't work
- anymore.
+ This is also an issue for Ubuntu.
** Description changed:
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.
+ applet, all do nothing. This is also an issue for Ubuntu.
- 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.
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https://bugs.launchpad.net/bugs/1280958
Title:
Brightness settings don't change anything
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