A method for adjusting operation parameters of a computer system based on power consumption of the computer system is disclosed. During a power state transition of the computer system, a voltage level of a power supply signal may be sampled at a plurality of time points to generate a multiple voltage level samples. A voltage level of a selected one of the multiple voltage level samples may be adjusted using a particular coefficient of multiple coefficients to generate an updated voltage level sample. A power consumption of the computer system may be determined using the updated voltage level sample, and based on the power consumption, at least one operation parameter of the computer system may be adjusted.