Comment 3 for bug 287428

 $ xprop -root |grep XKB
 _XKB_RULES_NAMES_BACKUP(STRING) = "evdev", "pc105", "cz", "qwerty", ""
 _XKB_RULES_NAMES(STRING) = "evdev", "thinkpad60", "us,cz", ",qwerty_bksl", grp:caps_toggle,grp:win_switch,srvrkeys:none,nbsp:level2,grp:menu_toggle"

 $ xev
 [...]
 KeyPress event, serial 30, synthetic NO, window 0x4200001,
    root 0x7d, subw 0x0, time 247541486, (248,166), root:(263,257),
    state 0x10, keycode 151 (keysym 0x1008ff2b, XF86WakeUp), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

 KeyRelease event, serial 33, synthetic NO, window 0x4200001,
    root 0x7d, subw 0x0, time 247541534, (248,166), root:(263,257),
    state 0x10, keycode 151 (keysym 0x1008ff2b, XF86WakeUp), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False
 [...]