I'm running Mint 13 64-bit with Cinnamon on my Sony Vaio notebook (AMD Radeon™ HD 7340 Graphics, AMD E2-1800 Accelerated Processor)
I tried adding the following to /etc/rc.local, but did not cure it (I think permission to edit is denied, even with sudo or when I 'chmod o+w').
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echo 3> /sys/class/backlight/acpi_video0/brightness
N.B. I used 3 as there seem to be 15 brightness levels to choose from with lower being dimmer.
Can anybody suggest how to make the screen less bright every start?
EDIT
I tried adding the following to /etc/default/grub, but all it did was remove all brightness controls (slider and F keys!)
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acpi_backlight=vendor