Dell laptops with the Intel 18260 wireless card installed may experience problems with Wake-on-LAN (WOL) when re-docked while in a sleep state. Updating to the latest driver should resolve this problem.
Dell laptops with the Intel 18260 wireless card (Dell part number J7Y3C) installed may experience an issue with waking after being re-docked while in a sleep state. When the laptop is reattached to the dock while in a sleep state (the laptop powered on but with the LCD closed), the network card appears to search for a wireless network to join but will not let the laptop wake. A hard reboot is required to get the laptop functioning again. This issue has been reported on the Latitude E7270 but may be seen on additional laptops using the Intel 18260 wireless card.
A new driver is now available at Dell's Support Website which should resolve this issue. If you are experiencing this issue, it is recommended you download and install the latest version (A20 or later) of the Intel 18260 WiFi driver.
You can install the latest driver by following the steps below: