Issues Enabling ReBAR/Disabling CSM

[PadenBeecher]

So today I decided to attempt enabling Resizable Bar and enjoying the free FPS gains and... it worked. Kinda.

 

The short of my issue is: I manage to get Resizable Bar on, but once I disable CSM, I can't see my BIOS. (I can boot into BIOS, I just don't see any display.) It can however still boot into windows normally.

 

Here is what I have done, in this order:

-Updated MOBO BIOS (vers. F33j)

-Updated VBIOS for GPU

-Updated Nvidia Drivers (vers. 466.27)

-Changed my Windows Boot from MBR to GPT

-Used MSInfo32 to confirm BIOS mode is UEFI

-Disabled CSM Support in bios.

-Enabled ReBAR in BIOS. (4G Decoding ON)

-Saved BIOS, booted into Windows

-Verified ReBAR in Nvidia Control Pannel.

-Rebooted into BIOS. (MOBO reads Ab, code for in BIOS)

 

From here, my display receives no input despite being in the BIOS. (Able to confirm by pressing escape + enter and rebooting PC w/out needing to reset or clear CMOS)

 

Additional things I have tried:

-Different HDMI Cables

-Forcing Windows into UEFI Settings via Recovery Mode

-Clearing CMOS and only disabling CSM

-Flashbacking to old BIOS vers.

-Checking PCIe Display Output in BIOS when disabling CSM

-Hotswapping HDMI while in BIOS

-Different HDMI Ports on GPU

 

I did read somewhere that people were having issues with CSM when on Display Port or using the silent BIOS on their GPU. 

Unfortunately for me, neither are my issue cause I using HDMI and my card is single BIOS.

 

Hypothetically, everything works with CSM disabled, I just can't access the BIOS afterwards to tweak anything without clearing CMOS.

I am completely out of ideas... maybe there is something I am not understanding? HELP!

 

PC Specs:

AMD 5950X

MSI RTX 3080 Gaming X Trio

Gigabyte Aorus X570 Master (v1.2) 

Sabrent Rocket 4 Plus M.2

G.Skill Trident Z Neo 3800 CL18 (32x4)

[diogogmaio]

On 5/3/2021 at 12:19 AM, PadenBeecher said:

So today I decided to attempt enabling Resizable Bar and enjoying the free FPS gains and... it worked. Kinda.

 

The short of my issue is: I manage to get Resizable Bar on, but once I disable CSM, I can't see my BIOS. (I can boot into BIOS, I just don't see any display.) It can however still boot into windows normally.

 

Here is what I have done, in this order:

-Updated MOBO BIOS (vers. F33j)

-Updated VBIOS for GPU

-Updated Nvidia Drivers (vers. 466.27)

-Changed my Windows Boot from MBR to GPT

-Used MSInfo32 to confirm BIOS mode is UEFI

-Disabled CSM Support in bios.

-Enabled ReBAR in BIOS. (4G Decoding ON)

-Saved BIOS, booted into Windows

-Verified ReBAR in Nvidia Control Pannel.

-Rebooted into BIOS. (MOBO reads Ab, code for in BIOS)

 

From here, my display receives no input despite being in the BIOS. (Able to confirm by pressing escape + enter and rebooting PC w/out needing to reset or clear CMOS)

 

Additional things I have tried:

-Different HDMI Cables

-Forcing Windows into UEFI Settings via Recovery Mode

-Clearing CMOS and only disabling CSM

-Flashbacking to old BIOS vers.

-Checking PCIe Display Output in BIOS when disabling CSM

-Hotswapping HDMI while in BIOS

-Different HDMI Ports on GPU

 

I did read somewhere that people were having issues with CSM when on Display Port or using the silent BIOS on their GPU. 

Unfortunately for me, neither are my issue cause I using HDMI and my card is single BIOS.

 

Hypothetically, everything works with CSM disabled, I just can't access the BIOS afterwards to tweak anything without clearing CMOS.

I am completely out of ideas... maybe there is something I am not understanding? HELP!

 

PC Specs:

AMD 5950X

MSI RTX 3080 Gaming X Trio

Gigabyte Aorus X570 Master (v1.2) 

Sabrent Rocket 4 Plus M.2

G.Skill Trident Z Neo 3800 CL18 (32x4)

I have the exact same issue.

Have you found a solution?