trying to edit brightness

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http://askubuntu.com – I'm trying to edit the /sys/class/backlight/max_brightness file to stop ubuntu 12 returning to maximum brightness on each reboot. gedit won't save the file after I have modified it I have used chown to change ownership to me which was successful. I then changed gedits settings so it won't save a backup but it still won't save. It returns with this error, Could not save the file /sys/class/backlight/acpi_video0/max_brightness. Unexpected error: Error writing to file: Input/output error is this yet another bug? (HowTos)