partial
xkb_symbols "pause" {
    key <PAUS> {
        [ XF86ScreenSaver, NoSymbol ]
    };
};

partial
xkb_symbols "webcam" {
    key <I220> {
        [ XF86ScreenSaver, NoSymbol ]
    };
};

partial
xkb_symbols "x1" {
    replace key <HOME> { [ Control_L, Control_L ] };
    replace key <END>  { [ Control_L, Control_L ] };
    modifier map Control { Control_L, <HOME>, <END> };
    replace key <TLDE> { [ Insert ] };
    replace key <ESC>  { [ grave, asciitilde, dead_grave, dead_tilde ] };
};