Mr Cameron's ministers will vote No to the referendum motion.
Chief Executive Donald Tsang announced, two days before polling day and after weeks of speculation, that he and his ministers would not vote in the by-elections.
Coalition members are supposed either to agree on their vote or abstain, but Brandenburg's premier voted for the law, and its interior minister voted against it.
His appointment was confirmed by a vote in which all ministers except the chairman of Yisrael Beiteinu, Avigdor Lieberman, voted in favour.
The ministers voted to accept the report even though most were not allowed to read the brunt of it, which was secret, Cabinet officials said.
Lib Dem cabinet ministers admitted that the party had been damaged over the past week amid confusion over how ministers would vote.
The voting members were elected by the national parliaments; ministers who attended did not vote.
What does a Member State have to fear from explaining to its own parliament why the minister voted as he or she did?
I agree with Michael Cashman that all citizens should know how their ministers vote in Council.
Mr Clegg and his ministers all -despite some private doubts - voted yes.