Lenovo ThinkPad T420 (English) User Guide - Page 202
ThinkPad NumLock, ThinkPad LCD, NVIDIA Optimus, Display, Enabled, OS Detection for NVIDIA
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Table 8. Config menu items (continued) • Off Display Boot Display Device • ThinkPad LCD • Analog (VGA) • Digital on ThinkPad • Digital 1 on dock • Digital 2 on dock Graphics Device • Integrated Graphics • Discrete Graphics • NVIDIA Optimus OS Detection for NVIDIA Optimus • Disabled • Enabled If you select "On", NumLock is always enabled. If you select "Off", NumLock is always disabled. Note: Power-On NumLock will be displayed if you select "Synchronized" at the ThinkPad NumLock. Select the display device that is to be active at boot time. This selection is effective for boot time, password prompt, and ThinkPad Setup. "Digital on Thinkpad" is DisplayPort on your computer. "Digial 1 on dock" and "Digital 2 on dock" are DisplayPort or DVI on docking station. Integrated Graphics will achieve longer battery life, and Discrete Graphics enhances performance. NVIDIA Optimus runs as Integrated Graphics mode and Discrete Graphics is enabled on demand. Note: NVIDIA Optimus mode should only be selected if you are using a Windows 7 model. System BIOS automatically switches Graphics device setting to NVIDIA Optimus mode if the OS supports the feature, and to Discrete Graphics if the OS does not support it. 184 User Guide