code: func DesktopGeometrySet(xu *xgbutil.XUtil, dg *DesktopGeometry) error {
  	return xprop.ChangeProp32(xu, xu.RootWin(), "_NET_DESKTOP_GEOMETRY",
  		"CARDINAL", uint(dg.Width), uint(dg.Height))
  }
docs: // _NET_DESKTOP_GEOMETRY set