I followed these steps to reset the SMC:
- Connect the power supply
- Completely shut down the computer
- Hold down Control-Option-Shift as well as the Power button
- Release everything simultaneously
The light on the power supply connector will briefly blink/change color. After that, power on the computer normally.
The above process should work for any Apple laptop that has a non-removable battery. Instructions for resetting the SMC on other Apple computers are available here.