Ubuntu[Dell] brightness/Bluetooth/Wireless problem at Start Up fixed

Edit your /etc/rc.local file by adding following lines before exit 0.


# for fixing brightness issue
sudo echo 7 > /sys/class/backlight/acpi_video0/brightness

# for fixing bluetooth to disabled at startup
rfkill block bluetooth

# for fixing wireless wlan0 to be disabled at startup
sudo ifconfig wlan0 down




and done restart the system and you will see the change.

Note: Fixes above are independent of laptop's build/brand.

References:
[1]. http://thanhsiang.org/faqing/node/180
[2]. http://www.cebuntu.com/how-to/how-set-brightness-on-startup-ubuntu-12-04/
[3]. http://ubuntuforums.org/showthread.php?t=1977738
[4]. http://linux.die.net/man/8/ifconfig