Sadly 4.1c does not support 19.1.1, as it gives the Unknown OpenCL version error and suffers a hashrate loss because of it.
-clkernel 3 mode does not even work with it. ( clSetKernelArg (-49) )
I have 19.1.1 installed and latest version of miner works normal. RX 580 8 Gb Windows 10.
That`s strange... Well, I guess I can go back to 18.12.3 until we get a fix.
2019.01.19:21:21:33.279: main Phoenix Miner 4.1c Windows/msvc - Release build
2019.01.19:21:21:33.279: main Cmd line: -pool @@@
2019.01.19:21:21:33.279: main No CUDA driver found
2019.01.19:21:21:35.924: main OpenCL driver version: 19.1.1
2019.01.19:21:21:35.924: main Unknown OpenCL driver version! Hashrate and stale shares may suffer
2019.01.19:21:21:35.924: main OpenCL platform: OpenCL 2.0 AMD-APP (2348.3)
2019.01.19:21:21:35.924: main Ignoring old OpenCL driver(s), using driver version 19.1.1
2019.01.19:21:21:35.924: main Available GPUs for mining:
2019.01.19:21:21:35.924: main GPU1: Radeon (TM) RX 480 Graphics (pcie 1), OpenCL 2.0, 8 GB VRAM, 36 CUs
2019.01.19:21:21:36.002: main ADL library initialized