BIOS UEFI settings - extensive clarification needed

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Aug 3, 2020
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I have a PC built around an MSI B450 Tomahawk Motherboard. It contains an AMD Ryzen 5 2600 CPU, as well as an ATI Radeon RX Vega10 GPU.

After installing Windows 10 (recently) I extended the system to a multiboot setting with 2 different Linux distributions. Everything works fine.

The other day I discovered that the BIOS settings were not completely UEFI, as the CSM remained enabled. On further search I found that there (at least) 2 places where UEFI can be set:
  • In the “Boot” menu there is the option "Boot mode select": "Legacy+UEFI" or "UEFI"
  • In the “Advanced” menu there is an entry “Windows OS configuration” / “BIOS UEFI/CSM Mode”: "CSM" or "UEFI"
I enabled the first UEFI setting without any problem. All 3 O/S’s booted perfectly. The problem arises with the second setting.

If I change that to “UEFI” 2 additional entries appear (as stated in the manual):
  • GOP Information
  • Secure Boot
I don’t want to enable Secure Boot, so I’ll ignore that one.

On entering the entry “GOP Information” I find the following:
  • Unknown Device
  • Unknown driver
When saving these changes and rebooting I find that Windows no longer will boot. It just hangs at the blue revolving dots screen. After some experimentation, I found out, that when I subsequently reboot again, this section suddenly becomes filled with reference to my VEGA10 and some AMD driver. But Windows still won’t boot!

Note that Linux keeps booting all the time, albeit in a slightly different manner than before.

So please someone tell me what is going on.
 
Last edited:

Svet

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What GPU brand and exact model is this?
BIOS version that your board is using?
 
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Here are my specs:
  • Motherboard: B450 TOMAHAWK version 1.0, BIOS Version 1.E0 Date 2020-06-09
  • GPU: ATI Radeon RX Vega, Revision C4, BIOS Version 111 (PowerColor Red Dragon RX VEGA 56 Radeon RX Vega 56 8 GB HBM2)
  • CPU : AMD Ryzen 5 2600 Six-Core Processor
Let me know if you need more information.
 

quorum7159902e1

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Aug 12, 2020
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Hello, Markus from Germany. Iam glad to be here. I´ve the same issue too with the latest Bios Version for my b450 Tomahawk. If I set the boot-option to only "UEFI" the comp doesn´t boot.
My Specs:
Motherboard: MSI B450 Tomahawk with the Bios from June 2020
CPU: Also the AMD Ryzen 5 2600
GPU: Nvidia RTX 2060 Super from KFA2
Any suggestions for this are very helpfull. Thanks
 

Svet

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Administrator
Joined
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Messages
75,887
Here are my specs:
  • Motherboard: B450 TOMAHAWK version 1.0, BIOS Version 1.E0 Date 2020-06-09
  • GPU: ATI Radeon RX Vega, Revision C4, BIOS Version 111 (PowerColor Red Dragon RX VEGA 56 Radeon RX Vega 56 8 GB HBM2)
  • CPU : AMD Ryzen 5 2600 Six-Core Processor
Let me know if you need more information.
There is no new BIOS to try at the moment.
I guess its some kind of BIOS issue or compatibility issue with your GPU used,
or some kind of vbios glitch of your GPU used.
check it with MSI here:
>>How to contact MSI.<<
 
Joined
Aug 3, 2020
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I found the problem. It is in the BIOS, under Advanced/PCI Subsystem Settings the option “Above 4G memory/Crypto Currency mining”. When disabled I can now boot in full UEFI mode. When enabled Windows will not boot.

It was not necessary to reinstall, just rebooting and loading BIOS defaults, followed by enabling "UEFI" in the “Advanced” menu under “Windows OS configuration” / “BIOS UEFI/CSM Mode”, made this clear.

In my opinion this is a bug, but so far MSI Tech Support has not confirmed this.
 

Hardcore Games™

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Apr 20, 2020
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For Windows use UEFI for the boot use UEFI

This will boot the fastest as windows can interact with the DMI etc
 
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