Hello dear mates, I hope this shoots some light to people stuck with this hardfork or people without wanting to use SoftPowerPlayTables

I installed CastXMR v1.5.0 using same drivers 18.4.1 as when using CastXMR 1.4, the day before the hardfork hashing OK
Now the day after hardfork each vega 56 is hashing 800h/s.

Be careful with running all your GPUs for tests because power consumption is increased. For safety run only 1 or 2 to test if overclock/undervolt works fine.

EDIT: No need for ati patch using 18.6.1 also applying overclock takes place without the need to use a dummy overclock before the desired one.

Solution to fix it
1) Uninstalled Adrenalin Drivers v18.4.1 using DDU 18.0.0.2, restart
2) Installed Adrenalin Drivers v18.6.1, restart

After these two steps, overclocks/undervolt overclocking and undervolt is working without soft power tables.Now i'm hashing 7% slower than before and power consumption increased by 13%.

My setup working with overclock and undervolt no need for SoftPowerPlayTables is the following:
don't know if you can get the best undervolt/overclock using this method or using SoftPowerPlayTables, but works fine for me
-CastXMR v1.5.0
-Adrenalin Drivers v18.6.1 settings by default (HBCC comes off by default as well as crossfire is off by default even having more than 1 gpu)
-OverdriveNTool v2.7 beta 4 (http://www.dropbox.com/s/equ297p3otqu28n/OverdriveNTool 0.2.7beta4.7z?dl=1)
-Watchdog script: HashMonitor.ps1 (https://github.com/fiddlefingers/Fiddlefingers-cast_xmr-hashrate-monitor-and-restart-tool/blob/master/HashMonitor.ps1)


Cheers mates