xev diz que o remapeamento Caps Lock funcionou, mas outros aplicativos não o veem

Question

Estou tentando remapear o Caps Lock para Control. Antes de modificar qualquer coisa, xev relata o seguinte para um pressionamento / liberação de Caps Lock:

KeyPress event, serial 73, synthetic NO, window 0x2600001,
    root 0x290, subw 0x0, time 50243576, (82,130), root:(1365,612),
    state 0x0, keycode 66 (keysym 0xffe5, Caps_Lock), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

PropertyNotify event, serial 73, synthetic NO, window 0x2600001,
    atom 0x17c (XKLAVIER_STATE), time 50243577, state PropertyNewValue

PropertyNotify event, serial 73, synthetic NO, window 0x2600001,
    atom 0x17c (XKLAVIER_STATE), time 50243579, state PropertyNewValue

KeyRelease event, serial 73, synthetic NO, window 0x2600001,
    root 0x290, subw 0x0, time 50243680, (82,130), root:(1365,612),
    state 0x2, keycode 66 (keysym 0xffe5, Caps_Lock), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

Eu corro o seguinte para remapear:

xmodmap -e 'remove Lock = Caps_Lock'
xmodmap -e 'keysym Caps_Lock = Control_L'
xmodmap -e 'add Lock = Caps_Lock'
xmodmap -e 'clear Lock'
xmodmap -e 'keycode 66 = Control_L'

Agora, para uma impressão / liberação no Caps Lock, xev relatórios:

KeyPress event, serial 80, synthetic NO, window 0x2600001,
    root 0x290, subw 0x0, time 50785441, (11,140), root:(1294,622),
    state 0x0, keycode 66 (keysym 0xffe3, Control_L), same_screen YES,
    XKeysymToKeycode returns keycode: 37
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 80, synthetic NO, window 0x2600001,
    root 0x290, subw 0x0, time 50785521, (11,140), root:(1294,622),
    state 0x0, keycode 66 (keysym 0xffe3, Control_L), same_screen YES,
    XKeysymToKeycode returns keycode: 37
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False

Isso parece bom, mas a chave ainda funciona como Caps Lock em todos os outros aplicativos. Eu notei que quando pressiono a tecla de controle esquerda 'real' não há XKeysymToKeycode , mas não tenho idéia do que isso significa.

Aqui estão os eventos para a tecla Ctrl pressionada / liberada:

KeyPress event, serial 37, synthetic NO, window 0x2600001,
    root 0x290, subw 0x0, time 57111640, (176,176), root:(188,272),
    state 0x0, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyRelease event, serial 37, synthetic NO, window 0x2600001,
    root 0x290, subw 0x0, time 57111736, (176,176), root:(188,272),
    state 0x4, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False