This is the fix. It's still an issue in 16.10 Yakkety with the latest drivers and everything else. I did a fresh install.
https://itsfoss.com/fix-brightness-ubuntu-1310/ FIX BRIGHTNESS CONTROL ISSUE WITH INTEL CARD IN UBUNTU 14.04 AND LINUX MINT 17: Open a terminal and create the following configuration file, if it does not exist: sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf Now we need to edit this file. You can use any editor be it a terminal one or graphical. sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf Add the following lines to this file: Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection Save it. Log out and log in back. The brightness control should be working through function keys now: ?field.comment=This is the fix. It's still an issue in 16.10 Yakkety with the latest drivers and everything else. https://itsfoss.com/fix-brightness-ubuntu-1310/ FIX BRIGHTNESS CONTROL ISSUE WITH INTEL CARD IN UBUNTU 14.04 AND LINUX MINT 17: Open a terminal and create the following configuration file, if it does not exist: sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf Now we need to edit this file. You can use any editor be it a terminal one or graphical. sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf Add the following lines to this file: Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection Save it. Log out and log in back. The brightness control should be working through function keys now: ** Attachment added: "bug-report.txt" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1503168/+attachment/4695472/+files/bug-report.txt -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1503168 Title: [Dell Inspiron 5551][8086:0f31] Unable to adjust brightness To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1503168/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
