A Sunnybank karaoke restaurant licensee has been fined after drunk patrons were allowed to keep drinking, an "extremely violent" brawl broke out and cigarettes were stubbed out on the floor.

This week, the Holland Park Magistrates Court convicted the restaurant's licensee company on 11 charges under the Liquor Act, and fined it $40,000.

A Sunnybank karaoke restaurant has been fined $40,000.

The approved manager was also convicted on one charge and fined $750.

It was the second time the licensee had been convicted and fined but the venue cannot be named under Office of Liquor and Gaming rules.