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Specific function keys not working

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linux-howto

http://askubuntu.com – My Toshiba C800 laptop (12.04lts desktop) has special function keys as follows: fn+ F2-BRIGHTNESS DOWN F3-BRIGHTNESS UP F4-DISPLAY SELECT F5-TOUCH PAD on/off F6-PREVIOUS F7-PLAY/PAUSE F8-NEXT F9-VOLUME DOWN F10-VOLUME F11-MUTE F12-WiFi on/off F6 to F11 (media player keys) work correctly, but the keys from F2 to F5 and F12 are not working. Why would some function keys work, but not others? What can be done to fix this? (HowTos)