This hotkey should incrementally increase the laptop display brightness.
It is a combination of "Fn" + "up". On the keyboard itself there is the
standard "arrow up" icon accompanied by an additional icon resembling a
dial (or sun) with a smaller arrowhead pointing up positioned above the
dial (or sun).

keycode as reported by keyboard shortcuts is:
0xd4

dmidecode output:
Dell Inc.
Inspiron 1420                   
Not Specified

-- 
brightness buttons only lower brightness, inpiron 1420
https://bugs.launchpad.net/bugs/144123
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