Abstract: An information handling system inverter powers a display backlight at variable brightness levels determined by a brightness module integrated in the inverter. The brightness module sums a user interface setting, automated brightness setting and ambient light sensor measurement input into the inverter to determine the inverter power output, thus simplifying the integration of user brightness settings with automated brightness adjustments, such as DPST adjustments. A brightness range register holds maximum and minimum brightness settings for output by the brightness module. A calibration register holds a calibration brightness setting for calibration of display brightness.

Abstract: A clock diagnostics module, such as a state machine, integrated into an integrated clock controller monitors clock signals associated with the integrated clock controller and reports the status of the clock signals through a management bus, such as an SMBus. For instance, a counter integrated into the integrated clock controller counts clock signal cycles that occur in a management bus cycle and compares the clock signal with an expected value to determine the accuracy of the clock. A power on reset allows the management bus to read the clock diagnostics module in the event of clock controller failure.

Abstract: An information handling system (IHS) employs a power fault protection circuit to protect the IHS from overvoltages which may occur on an information line from a power adapter to the IHS. The system includes a processor coupled to the protection circuit. The circuit is operative in a first mode to decouple an information line from the IHS in response to a disable command and operative in a second mode to decouple the information line from the IHS when a voltage in the information line exceeds a predetermined threshold voltage.