As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT AFTER SWITCHING PACK 1 BACK ON, COCKPIT FILLED WITH SMOKE. AFTER SWITCHING PACK 1 BACK OFF SMOKE DISSIPATED-C/A-PERFORMED FIM TASK PROCEDURES EMB 145 FIM 21-20-00. RAN PACK 1 AND PACK 2 AND PERFORMED ALL VISUAL INSPECTIONS. NO DISCREPANCIES NOTED. PERFORMED ETN-EM-72-034 PROCEDURES RAN ENGINES WITH CREW. DOCUMENTED ALL VALUES. NO SMOKE DETECTED IN COCKPIT OR CABIN. AIRCRAFT OKAY FOR SERVICE