I'm no expert but a working command you can use to change the display
brightness temporarily as a normal user is:
echo somevalue | sudo tee /sys/class/backlight/acpi_video0/brightness
For example if you want to set the brightness to 2, run following:
echo 2 | sudo tee /sys/class/backlight/acpi_video0/brightness
If the command is run as root (like it's done if added to rc.local), you can
just use the echo x > ... command. If this doesn't work during startup, it's
very likely that the case is what Steve Langasek describes in another bug
report:
"And even if you get it to work at the commandline, this setting may be
getting overridden by the desktop after rc.local runs."
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https://bugs.launchpad.net/bugs/923940
Title:
Ubuntu 12.04 LTS set max lcd brightness on every boot
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