Brightness issue in Linux mint 14

I recently installed linux mint 14 (Nadia) in my office laptop (HP Notebook 450 ). after installation when I booted into the os , the screen brightness was set very very low which I was able to adjust using the brightness function key. Later I had the same problem when Ubuntu 12.10 was installed on the same laptop. So here is a permanent fix for the issue.

  • Current brightness value is stored in /sys/class/backlight/acpi_video0/brightness file.
  • Maximum brightness value is stored in /sys/class/backlight/acpi_video0/max_brightness file.
  • Add the following line to /etc/rc.local init script. ( If you want know what this file is, check this stackexchange question)
cat /sys/class/backlight/acpi_video0/max_brightness > /sys/class/backlight/acpi_video0/brightness