What was found
AFTER TAKEOFF AND SUBSEQUENTLY TURNING OFF PACKS, SMOKE FILLED THE ENTIRE AIRCRAFT. WITH ALL PACKS SHOWING NORMAL OPERATING TEMPERATURE, THE SMOKE DISSIPATED WITHIN A MINUTE. CREW FOLLOWED COCKPIT OPERATING PROCEDURE, DUMPED 177,000 POUNDS OF FUEL, AND RETURNED TO LAX. FOUND NR 1 PACK FILTER WITH OIL SMELL. NR 2 AND NR 3 PACKS CHECKED OK. DEFERRED NR 1 PACK PER MEL 21-1A.