From Fedora Project Wiki
/* This table is still unfinished! But is contains support for keycodes that just made it into the kernel.
TODO:
- get the meaning for the last few unclear linux keycodes
- find proper range for the numerical values and assign values
- better grouping/order
- prefixes (like XF86) needed? and for which keysyms
- CamelCase vs. Capitalized_With_Underscores
- /
/* Unclear meaning (all from remote control) */
/* Teletext control/Game pad buttons */
/* Advanced editing */
/* Function key combinations that produce their own key press event.
May be let mapping them to something useful to the user as they don't carry semantic information.
FN_ESC, FN_B, FN_D, FN_E, FN_F, FN_S
FN_F1, FN_F2, FN_F3, FN_F4, FN_F5, FN_F6, FN_F7, FN_F8, FN_F9, FN_F10, FN_F11, FN_F12
- /
/* Media */
/* Remote Control, switch to other source */
/* XXX may be use a common prefix for them; "Media_" ??? */
/* Menu navigation */
/* Media Center control */
/* Applications */