'''ThinkLight'''''(n)''''':''' A bright white LED above the screen of recent ThinkPads designed to illuminate the keyboard.  It is toggled on and off by pressing Fn+PgUp.

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Since it is BIOS controlled, it will work on every Ubuntu flavour right out-of-the-box.
For more information see [[http://www.thinkwiki.org/wiki/ThinkLight|ThinkWiki]].