Lenovo ThinkPad L420 Keyboard Mapping

If you run "PSD=ACPI.PSD /NOACPI" you have access to the special keys:
 * Left Side Keys
 * Mute Mic: 0x6A (106)
 * Volume Up: 0xCC (204)
 * Volume Down: 0xDE (222)
 * Sound Mute: 0x0 (0)
 * Function Keys
 * Fn Key = 0x89 (137)
 * Fn+Esc = Inter = 0x6E (110)
 * Fn+F2 = Lock = 0x11 (17)
 * Fn+F3 = Battery = 0x12 (18)
 * Fn+F4 = Sleep = 0x13 (19)
 * Fn+F5 = Wireless = 0x8A (138)
 * Fn+F6 = Camera/Headset = 0x8B (139)
 * Fn+F7 = Screen/Display = 0x16 (22)
 * Fn+F8 = Trackpoint/Trackpad = 0x17 (23)
 * Fn+F12 = Hybernate = 0x1B (27)
 * Fn+Insert = Brighness down = 0x15 (21)
 * Fn+Insert = Brighness up = 0x14 (20)
 * Fn+Up = Stop = 0xD4 (212)
 * Fn+Down = Play/Pause = 0xD2 (210)
 * Fn+Left = Back = 0xC0 (192)
 * Fn+Right = Forward = 0xC9 (201)
 * Fn+BackPage = Page Left = 0x6A (106)
 * Fn+AdvPage = Page right = 0x8F (143)