Only new drivers support need to be updated. 19.4.3 is the last full supported at now by Phoenix miner.
Just updated to AMD driver version 19.5.2 (June 2019) 2766.5. Working again :-)
You want to say that on 19.5.2 Phoenix woks with -clKernel 3?
Yes. On a RX 580 8GB
I'm using Nitro RX580 8GB, PhoenixMiner 4.2c, AMD Driver 19.3.3 with -clKernel 3, but it can not load DAG into VRAM with error clCreateBuffer -4.
You did something wrong... Max AMD driver that miner have full support is 19.4.3.
So just try to install 19.4.3.