yes, I tried, but nothing has changed. 3,5MH/s on a 5700XT.

But if you read Claymore's latest post in the dual miner topic he added a PS to his post:

"PS. AMD still has no public Navi drivers with DAG-fix, so currently 5700XT shows a very bad hashrate. But AMD already solved this issue and they promise to release public drivers soon..."