X11 Keyboard Mapping

Alt vs Mode_switch

Beginning with X11.pkg 2.1.0, the default keyboard mapping reverted to using Alt for Mode_switch. This decision was made due to user feedback and to maintain consistency with Tiger's X11 keyboard mapping. If you wish to change to Alt instead of Mode_switch, try using one of the following ~/.Xmodmap files:

! This one switches both alt keys to be alt:
keycode 66 = Alt_L
keycode 69 = Alt_R
clear mod1
add mod1 = Alt_L Alt_R

! This one leaves the right alt as Mode_switch and places Alt on a separate X11 modifier assignment
keycode 66 = Alt_L
! keycode 69 = Mode_switch
clear mod1
clear mod4
add mod1 = Mode_switch
add mod4 = Alt_L