anchor.diff:          the kernel configures "max_performance".
         '';
       };
  -    
  +
     };
   
   
  
positive.code:   config = mkIf (config.powerManagement.scsiLinkPolicy != "") {
  
      jobs."scsi-link-pm" =
        { description = "Set SCSI link power management policy";
  
          startOn = "started udev";
  
          task = true;
  
          script = ''
            for x in /sys/class/scsi_host/host*/link_power_management_policy; do
              echo ${config.powerManagement.scsiLinkPolicy} > $x
            done
          '';
        };
        
    };
  
  }
  
negative.code:   ###### interface
  
    options = {
  
      powerManagement.scsiLinkPolicy = mkOption {
        default = "";
        example = "min_power";
  