Cal. Code of Civil Procedure - CCP § 259. Section 259.
Subject to the supervision of the court, every court commissioner shall have power to do all of the following:
(a)
Hear and determine ex parte motions for orders and alternative writs and writs of habeas corpus in the superior court for which the court commissioner is appointed.
(b)
Take proof and make and report findings thereon as to any matter of fact upon which information is required by the court. Any party to any contested
proceeding may except to the report and the subsequent order of the court made thereon within five days after written notice of the court’s action. A copy of the exceptions shall be filed and served upon opposing party or counsel within the five days. The party may argue any exceptions before the court on giving notice of motion for that purpose within 10 days from entry thereof. After a hearing before the court on the exceptions, the court may sustain, or set aside, or modify its order.
(c)
Take and approve any bonds and undertakings in actions or proceedings, and determine objections to the bonds and undertakings.
(d)
Act as temporary judge when otherwise qualified so to act and when appointed for that purpose, on stipulation of the parties litigant. While acting as temporary judge the commissioner shall receive no compensation therefor other than compensation as
commissioner.
(e)
Hear and report findings and conclusions to the court for approval, rejection, or change, all preliminary matters including motions or petitions for the custody and support of children, the allowance of temporary spousal support, costs and attorneys’ fees, and issues of fact in contempt proceedings in proceedings for support, dissolution of marriage, nullity of marriage, or legal separation.
(f)
Hear actions to establish paternity and to establish or enforce child and spousal support pursuant to subdivision (a) of Section 4251 of the Family Code.
(g)
Hear, report on, and determine all uncontested actions and proceedings subject to the requirements of subdivision (d).