Lenovo ThinkPad T420 (English) User Guide - Page 200
Always On USB Charge in, Battery, Wake On LAN is
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Table 8. Config menu items (continued) USB Ethernet LAN Option ROM • Disabled • Enabled USB UEFI BIOS Support • Disabled • Enabled Always On USB • Disabled • Enabled Always On USB Charge in • Disabled off mode • Enabled If you select "AC and Battery", Wake On LAN is enabled with any power sources. Note: AC is required with magic packet type Wake On LAN. Note: Wake On LAN function does not work when a hard disk password is set. Load the Ethernet LAN Option ROM to enable startup from an integrated network device. Enable or disable boot support for USB diskette, USB memory key, and USB optical drive. If you select "Enabled", the external USB devices can be charged via USB ports even when the system is in low power mode (standby, hibernate, or power-off). If you select "Enabled", the Always On USB connector enables you to charge some devices, such as iPod and iPhone and BlackBerry smartphones. Note: If you want to charge these devices when your computer is in hibernation mode or powered off, you will need to open the Power Manager program and configure corresponding settings to enable the Always On USB connector function. For details about how to enable the Always On USB connector function, refer to the online help of the Power Manager program. 182 User Guide