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Network failure when enabling CSM

TheGermanEngie
By TheGermanEngie
in Troubleshooting
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Hi all - in the latest rev. of Windows 10 (20H2) when disabling CSM in UEFI, the network adapter fails and it cannot recognize any drivers or sign of connection. The NIC is just blinking yellow. I need CSM to be disabled, because my Tesla accelerator needs "Above 4G Decoding" to be enabled in order to post. Enabling Above 4G Decoding requires CSM be disabled. I'm in a big catch 22. 

 

I'm using a Titan X Maxwell as a display GPU and a Tesla M40 24GB in the second PCI-e x16 slot. Interestingly, I had no issues disabling CSM in the past, but instead of a Titan X I used a small low profile Quadro for display, because the Tesla has no display outputs.

 

Help and suggestions are very much appreciated. If need be I can move this to the Windows thread.

 

Edit 1: Disabling CSM does not prevent network failure, but enabling "Above 4G Decoding" does. 

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https://linustechtips.com/topic/1309005-network-failure-when-enabling-csm/
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CSM is commonly used so you can boot with MBR drives and isn't on by default. Do you have an older OS install that needed CSM enabled?

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System specs would help, particularly what board you have.

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5 minutes ago, TheGermanEngie said:

I have an AMD ASRock X370 Taichi, UEFI Rev. 6.20. 

What CPU do you have?

Main Rig:-

Ryzen 7 3800X | Asus ROG Strix X570-F Gaming | 16GB Team Group Dark Pro 3600Mhz | Corsair MP600 1TB PCIe Gen 4 | Sapphire 5700 XT Pulse | Corsair H115i Platinum | WD Black 1TB | WD Green 4TB | EVGA SuperNOVA G3 650W | Asus TUF GT501 | Samsung C27HG70 1440p 144hz HDR FreeSync 2 | Ubuntu 20.04.2 LTS |

 

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11 minutes ago, rickeo said:

CSM is commonly used so you can boot with MBR drives and isn't on by default. Do you have an older OS install that needed CSM enabled?

CSM is used when a hardware is missing UEFI support, mostly graphics cards.

 

5 minutes ago, TheGermanEngie said:

I have an AMD ASRock X370 Taichi, UEFI Rev. 6.20. 

There is a 6.40 bios update, but I dont see anything related to this particular issue. Your issue might be a bug as I never heard of a similar problem before.

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2 minutes ago, Levent said:

CSM is used when a hardware is missing UEFI support, mostly graphics cards.

 

There is a 6.40 bios update, but I dont see anything related to this particular issue. Your issue might be a bug as I never heard of a similar problem before.

I have made an update to my findings: disabling CSM on its own doesn't affect my network connection, but after enabling "Above 4G Decoding" does. The M40 is UEFI ready, as is my Titan X. 

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2 minutes ago, TheGermanEngie said:

I have made an update to my findings: disabling CSM on its own doesn't affect my network connection, but after enabling "Above 4G Decoding" does. The M40 is UEFI ready, as is my Titan X. 

Its not your board but I found something that sounds very similar...

 

 

Main Rig:-

Ryzen 7 3800X | Asus ROG Strix X570-F Gaming | 16GB Team Group Dark Pro 3600Mhz | Corsair MP600 1TB PCIe Gen 4 | Sapphire 5700 XT Pulse | Corsair H115i Platinum | WD Black 1TB | WD Green 4TB | EVGA SuperNOVA G3 650W | Asus TUF GT501 | Samsung C27HG70 1440p 144hz HDR FreeSync 2 | Ubuntu 20.04.2 LTS |

 

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Intel NUC running Server 2019 + Synology DSM218+ with 2 x 4TB Toshiba NAS Ready HDDs (RAID0)

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6 minutes ago, Master Disaster said:

Its not your board but I found something that sounds very similar...

 

 

I will try to find any sort of relevant network settings this post is referencing, but I'm highly skeptical because of their modded BIOS. I'm completely stock. 

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1 minute ago, TheGermanEngie said:

I will try to find any sort of relevant network settings this post is referencing, but I'm highly skeptical because of their modded BIOS. I'm completely stock. 

SR-IOV is not a network setting, its used by the system to split access to a devices resources amongst multiple other devices.

 

It should be a setting somewhere in your BIOS.

Main Rig:-

Ryzen 7 3800X | Asus ROG Strix X570-F Gaming | 16GB Team Group Dark Pro 3600Mhz | Corsair MP600 1TB PCIe Gen 4 | Sapphire 5700 XT Pulse | Corsair H115i Platinum | WD Black 1TB | WD Green 4TB | EVGA SuperNOVA G3 650W | Asus TUF GT501 | Samsung C27HG70 1440p 144hz HDR FreeSync 2 | Ubuntu 20.04.2 LTS |

 

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Intel NUC running Server 2019 + Synology DSM218+ with 2 x 4TB Toshiba NAS Ready HDDs (RAID0)

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7 minutes ago, Master Disaster said:

SR-IOV is not a network setting, its used by the system to split access to a devices resources amongst multiple other devices.

 

It should be a setting somewhere in your BIOS.

Enabling SR-IOV made no difference. I also tried enabling "Above 4G MMIO" with the 40 bit address. Still no difference.

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4 minutes ago, TheGermanEngie said:

Enabling SR-IOV made no difference. I also tried enabling "Above 4G MMIO" with the 40 bit address. Still no difference.

After you enabled SR-IOV did you uninstall the NIC from Windows, reboot and let Windows redetect it?

Main Rig:-

Ryzen 7 3800X | Asus ROG Strix X570-F Gaming | 16GB Team Group Dark Pro 3600Mhz | Corsair MP600 1TB PCIe Gen 4 | Sapphire 5700 XT Pulse | Corsair H115i Platinum | WD Black 1TB | WD Green 4TB | EVGA SuperNOVA G3 650W | Asus TUF GT501 | Samsung C27HG70 1440p 144hz HDR FreeSync 2 | Ubuntu 20.04.2 LTS |

 

Server:-

Intel NUC running Server 2019 + Synology DSM218+ with 2 x 4TB Toshiba NAS Ready HDDs (RAID0)

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3 minutes ago, Master Disaster said:

After you enabled SR-IOV did you uninstall the NIC from Windows, reboot and let Windows redetect it?

I just tried that. It came back up but with the same exclamation point as I had before. Should I try again with Above 4G MMIO enabled?

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4 minutes ago, TheGermanEngie said:

I just tried that. It came back up but with the same exclamation point as I had before. Should I try again with Above 4G MMIO enabled?

Can't hurt. If that doesn't work I'm out of ideas.

Main Rig:-

Ryzen 7 3800X | Asus ROG Strix X570-F Gaming | 16GB Team Group Dark Pro 3600Mhz | Corsair MP600 1TB PCIe Gen 4 | Sapphire 5700 XT Pulse | Corsair H115i Platinum | WD Black 1TB | WD Green 4TB | EVGA SuperNOVA G3 650W | Asus TUF GT501 | Samsung C27HG70 1440p 144hz HDR FreeSync 2 | Ubuntu 20.04.2 LTS |

 

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Intel NUC running Server 2019 + Synology DSM218+ with 2 x 4TB Toshiba NAS Ready HDDs (RAID0)

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22 hours ago, Master Disaster said:

Can't hurt. If that doesn't work I'm out of ideas.

Nothing worked. I'm completely dumbfounded.. guess I'll have to use Ubuntu since that's the only OS that seemed to work.

 

Edit: this guy on L1T seems to have had the same problem. Looks like a memory allocation issue. https://forum.level1techs.com/t/pc-will-not-boot-with-tesla-m40/160416/17

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