gistfile1.txt

! Chromebook C720 ~/.Xmodmap
! Huan Truong - 2014
! = <1:Key> <2:Shift+Key> <3:mode_switch+Key> <4:mode_switch+Shift+Key> <5:AltGr+Key> <6:AltGr+Shift+Key> <7:Ctrl+Alt+Key>

! Clear both Alt keys mapping
clear Mod1
add mod1    = Alt_L
! Make the right alt key to be the mode switch key
keycode 108 = Mode_switch

keycode  67 = XF86Back F1 F1 F1 F1 F1 XF86Switch_VT_1
keycode  68 = XF86Forward F2 F2 F2 F2 F2 XF86Switch_VT_2
keycode  69 = XF86Refresh F3 F3 F3 F3 F3 XF86Switch_VT_3

! "Full screen" key
keycode  70 = F11 F4 F4 F4 F4 F4 XF86Switch_VT_4

! "Rename" key
keycode  71 = F2 F5 F5 F5 F5 XF86Switch_VT_5

keycode  72 = XF86MonBrightnessDown F6 F6 F6 F6 F6 XF86Switch_VT_6
keycode  73 = XF86MonBrightnessUp F7 F7 F7 F7 F7 XF86Switch_VT_7

! Right alt+keys will make it multimedia control keys
keycode  74 = XF86AudioMute F8 XF86AudioStop F8 F8 F8 XF86Switch_VT_8
keycode  75 = XF86AudioLowerVolume F9 XF86AudioPrev F9 F9 F9 XF86Switch_VT_9
keycode  76 = XF86AudioRaiseVolume F9 XF86AudioNext F10 F10 F10 XF86Switch_VT_10

! The "search" key is mapped to delete :)
! Alt+Search will make it caps lock
keycode 133 = Delete Delete Caps_Lock NoSymbol

! Right alt+arrows will make page up page down home and end 
keycode 111 = Up Up Prior Prior Up Up
keycode 116 = Down Down Next Next Down Down
keycode 113 = Left Left Home Home Left Left
keycode 114 = Right Right End End Right Right