Cornhuskers coach Tim Miles confirmed to the Lincoln Journal Star that White asked Nebraska athletic director Shawn Eichorst for his release Saturday.
White submitted his name for the NBA draft but withdrew hours before the deadline for underclassmen. The 6-foot-7 wing tried out with the Utah Jazz, Detroit Pistons, Chicago Bulls and Boston Celtics before making his decision.
White, who sat out the 2014-15 season after transferring from Kansas, averaged 16.6 points and 5.9 rebounds per game last season. He has one year of eligibility remaining.
Information from The Associated Press contributed to this report.