I have a problem where the brightness does not save after a reboot on 14.04 LTS, but I had the same problem on 12.04 LTS (before I broke the system). Before you say this is a duplicate of a million posts, I've tried every single option that has been mentioned. I've found that
xbacklght doesn't work no mater what I do with it. On my edited
/etc/rc.local, however, I've set it to execute, changed the permissions so it would run without
sudo and even changed the permissions of the
/sys/class/backlight/acpi_video0/brightness files (and yes I've tried the actual folder as well, not just the sym link). I got it to work a few times, but only for one boot until the permission changes reset themselves. Thanks for the help in advance!
EDIT: I just remeber that I also have a folder called
intel_brightness with it's own set of values that could affect how
acpi_video0 works. Sorry for forgetting to add this earlier