Resizable BAR working in GPU-Z and not available in AMD Software.

[2k1Sisi]

System

• Motherboard: MSI H310M Pro-M2
• BIOS Version: 1.70
• GPU: Sapphire Nitro+ Rx580 4GB
• [Yes] CSM is turned off. Make sure to confirm this in the BIOS and not with GPU-Z or similar since it can be inaccurate
• [Yes] 4G decoding is enabled. Make sure to confirm this in the BIOS and not with GPU-Z or similar since it can be inaccurate
• [No] UEFIPatch is applied (see Using UEFIPatch for more information). On some motherboards DSDT Patching is also needed
• [Yes] I have read Common issues (and fixes)

Description
Resizable BAR working in GPU-Z and not available in AMD Software.

Describe the issue here.
I tried reinstalling my GPU driver as it's said in "Common issues (and fixes)" but ReBAR is still disabled in AMD Adrenaline.
4G Decoding and ReBAR are enabled in BIOS
edited the regedit to enable ReBAR then used ReBarState and set it to 10
Am i missing something? my motherboard supports ReBAR and 4G decoding

[switchgard]

Did you try the registry modification laid out in Common issues (and fixes)?

If not then that's what you're missing... :D
Change these from 0 to 1 to enable, then reboot. That did it for me on the RX Vega 56 after completing the bios modification + 4G decoding enable/CSM disable.

If you don't want to use modded drivers you can apply the following .reg file (reboot after applying).

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000]
"KMD_RebarControlMode"=dword:00000001
"KMD_RebarControlSupport"=dword:00000001
"KMD_EnableReBarForLegacyASIC"=dword:00000001