[Ubuntu Wiki] Update of "Kernel/Debugging/Backlight" by ckrainey

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The "Kernel/Debugging/Backlight" page has been changed by ckrainey:
http://wiki.ubuntu.com/Kernel/Debugging/Backlight?action=diff&rev1=34&rev2=35

   * If using a v3.13.x+ series kernel, reboot with just kernel parameter video.use_native_backlight=1 and make a comment on if you can now alter the backlight with hotkeys or a brightness applet.
   * If your backlight hotkeys are Fn+Left and Fn+Right, add kernel parameter atkbd.softraw=0 to /boot/grub/menu.lst . Then, switch to any console, e.g. Ctrl+Alt+F1, login by root account and execute:<<BR>> {{{showkey -s}}} <<BR>> <<BR>> Then, press Fn+Left and Fn+Right key to check the code that shows up on screen. Post the results to the report. For example: <<BR>> <<BR>> Fn+Left: <<BR>> 0xe0 0x4c 0xe0 0xcc <<BR>> <<BR>> Fn+Right: <<BR>> 0xe0 0x54 0xe0 0xd4
  
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+ SEE ALSO:  [[https://help.ubuntu.com/community/ScreenBacklight|ScreenBacklight]]
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  === Intel HD Graphic Controllers ===
  
  With an Intel HD Graphic Controller if passing kernel parameter acpi_backlight does not work, or it freezes and/or crashes, one may try adjusting which backlight interface is used by creating a new file in {{{/usr/share/X11/xorg.conf.d/80-backlight.conf}}} and paste into it the following code: {{{