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setxkbmap -option numpad:macworked (setxkbmap -option numpad:pcto reverse; see mankier.com/7/xkeyboard-config#Options-Compatibility_options). I tried thexmodmap -e "keycode 77 ="(notedxmodmap -e "keycode 77 ="output first, so I could reverse); it worked, but also killed myAlt-Tab(switch applications) keypress.numpad:macworked perfectly! I has having a serious problem when I putnumlockx onin a quick loop to grant I would not turn it off for too long while playing games (when I miss click numlock key), but that makes the X server or the WM freeze for 1s ever 5to15s, I thought I was having a problem with my HD or Videocard or RAM, some hardware problem, etc. But was numlockx called wrongly, so often that way. I wanted to comment this in case someone makes the same mistake.