xev -event keyboard

KeyPress event, serial 28, synthetic NO, window 0x3c00001,
    root 0x296, subw 0x0, time 11159872, (-182,-262), root:(429,169),
    state 0x2010, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyPress event, serial 28, synthetic NO, window 0x3c00001,
    root 0x296, subw 0x0, time 11160807, (-182,-262), root:(429,169),
    state 0x2014, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

KeymapNotify event, serial 28, synthetic NO, window 0x0,
    keys:  4294967190 0   0   0   32  0   0   0   1   0   0   0   0   0   0   0
           0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0

KeyRelease event, serial 28, synthetic NO, window 0x3c00001,
    root 0x296, subw 0x0, time 11167048, (-182,-262), root:(429,169),
    state 0x201c, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyRelease event, serial 28, synthetic NO, window 0x3c00001,
    root 0x296, subw 0x0, time 11168000, (-182,-262), root:(429,169),
    state 0x2014, keycode 37 (keysym 0xffe3, Control_L), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False