[Ubuntu Wiki] Update of "Kernel/Debugging/Backlight" by xintx-ua

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The "Kernel/Debugging/Backlight" page has been changed by xintx-ua:
http://wiki.ubuntu.com/Kernel/Debugging/Backlight?action=diff&rev1=21&rev2=22

Comment:
sudo is not needed after sudo su

     * If you have folder /sys/class/backlight/intel_backlight/ :
      * type {{{sudo su}}} , and then execute:
      * ls -la /sys/class/backlight/intel_backlight/ > lslabacklight
-     * {{{sudo echo 8 > /sys/class/backlight/intel_backlight/brightness}}}
+     * {{{echo 8 > /sys/class/backlight/intel_backlight/brightness}}}
       * Please comment on if the brightness changes.
   * Reboot with kernel parameter video.use_bios_initial_backlight=0 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