We have Dell D531 laptops, that have quickset utility. There is an issue with the internal NIC configuration part of quickset switching off the NIC when operating on battery. This is supposedly only when the RJ45 cable is unplugged, but in practice, it doesn't come back up when the cable is plugged in. We have tried switching this off in control panel, but as soon as we reboot the laptop, it reverts back to default setting. Can't find registry entry to remove it either. Have also tried de-activating in device manager/broadcom NIC/Power management - unchecked "allow the computer to turn off this device to save power". Thi setting is maintained on re-boot, but is obviously ignored/over-ridden by quickset.