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fix ACER TM4750 backlight can not adjust on ubuntu 14.04

Install ubuntu 14.04 in ACER TM4750, you will find the hot key Fn+left,Fn+right can not adjust backlight

you can follow below modification to make it work normally.

1.modify grub
sudo vi /etc/default/grub
make sure GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX setting as below:
---
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
---

sudo update-grub

2.add 20-intel.conf under /usr/share/X11/xorg.conf.d/ folder
cd /usr/share/X11/xorg.conf.d/
sudo touch 20-intel.conf
sudo chmod 777 20-intel.conf
vi 20-intel.conf
---
Section "Device"
     Identifier  "card0"
     Driver      "intel"
     Option      "Backlight"  "intel_backlight"
     BusID       "PCI:0:2:0"
EndSection
---

save and reboot

after reboot, use hotkey Fn+left,Fn+right can adjust NB's backlight successfully.