Wake-On-System-Key on T640 is not working.
The HP T640 Thin Client can be ordered with the WOSK (Wake-One-System-Key) functionality to power on the Thin Client using a key combination (Alt-P by default). But pressing the key-combo doesn't wake up the Thin Client.
Make sure the keyboard is connected to the USB port directly next to the Ethernet RJ-45 connector (see picture). This also stops the red-white blinking pattern of the power-on button. When the keyboard is connected to any other USB-port, the WOSK function is NOT working.
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