As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CAPTAIN DETECTED SMOKE IN THE COCKPIT ALONG WITH AN ECAM MESSAGE OF (AVNCS SMOKE). THE FLIGHT RETURNED TO AIRPORT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE AVIONICS EQUIPEMENT VENTILATION COMPUTER DUE TO A FAILED BITE CHECK. BITE CHECKED OK AFTER REPLACEMENT OF THE AVIONICS EQUIPEMENT VENTILATION COMPUTER.