Disabling IPMI via JPB1 jumper on Supermicro A2SDi-4/8C-HLN4F disables fans as well

[evacuate_custody]

Hello,

I am trying to disable the IPMI interface on my 2 Supermicro A2SDi boards, one 4C and one 8C version, since I have a PiKVM which uses a lot less power. For this, I set the jumper JPB1 to bridge pins 2-3 on the boards. This successfully disables the IPMI interfaces, but has the consequence that it also disables the fans. Once disabled, none of the fans, no matter which header it is connected to, will spin up at all. This of course negatively impacts the thermal performance for the system.

Has anyone had the same experience? Is this intended behavior or a bug? I am using the latest BIOS and firmware versions for each of the motherboards.

 

[kapone]

In recent motherboards, Supermicro or otherwise, if the board has IPMI (or one of its variants), the fans are controlled by the built-in BMC, not the BIOS. In fact the BIOS may not even have settings for fans at all.

By disabling IPMI, you're disabling the BMC, which means...

 

[mrpasc]

According to the manual you can try to disable IPMI via Bios settings. This will disable extended IPMI functionality (so even faster boot), disable the IPMI LAN port as well but thermal monitoring and fan control remain functional.

 

[Jorge Perez]

What temperatures are you seeing?

The 8c should only be like 16w.

 

[RolloZ170]

I am trying to disable the IPMI interface on my 2 Supermicro A2SDi boards, one 4C and one 8C version, since I have a PiKVM which uses a lot less power.

disable the AST2400 will be 4W less then, there is a chipset left still working.