Alcohol-related incidents increased in Queensland's biggest nightclub precinct on the weekend despite the introduction of new licensing laws.

The Palaszczuk government has cut trading hours and placed restrictions on what alcohol can be served after midnight in Brisbane's Fortitude Valley in its bid to tackle alcohol-fuelled violence.

But NightWatch Patrols, a rapid response volunteer group run by chaplains, attended to more incidents on Friday and Saturday night than they did the previous weekend.

Senior team leader Chris Owens told AAP the numbers could have been even higher had it not been for the saturation of police in the safe night precinct zone.

"On Friday we were up by only two jobs and on Saturday we were up five or six incidents," Mr Owens said.

"There were boosted police numbers as well, so the amount of incidents may change once the police aren't out in force."

Under the new laws, licensed premises can only operate until 2am, unless they are within a designated safe night precinct, like Fortitude Valley, where the closing time is 3am.

The ban on the sale and supply of rapid intoxication drinks after midnight includes jelly shots, bombs and those containing more than 45 millilitres of spirits or liqueur.

A lockout of 1am at all venues will start in February.

Mr Owens said there appeared to be a lack of awareness about the change in trading hours and the restriction on what alcohol can be served after midnight among those attending the Valley on the weekend.

"What we've found so far is that it hasn't made any difference because the specific groups of people that come out, don't appear to be aware of the changes other than what they learned on the weekend," he said.

"I don't think we've seen the full effect of the new laws yet."

A spokesman for bars and clubs in the Valley says the new laws resulted in turnover being down as much as 20 per cent in some venues.