I will simply post here what I have done in my situation. Thanks to god/internet, I also found a post where a user has been able to control the fan speed with the ipmitool.
Recently I had to replace Dell certified mechanical hard drives with uncertified SSD drives on a PowerEdge T620 server and was unpleasantly suprised to find that the fans were spinning noisly when inserted.Īfter quick research, I discovered that it was a known issue and that Dell wasn't able to offer any solution… I've never tried to make a call to the DoBFn method outside of C# but I'll play with that and see what I come up with.Dell PowerEdge T620 : How To Reduce FAN Speed with IPMI "Class" and "Selector" are both shorts and I have some of the possible values listed here and here, with links to where I got them from (Linux code). It has a single parameter called "Data" which takes the byte array buffer that represents the command. The "DoBFn" is the method that needs to be called. In my limited experience, the presence of this method is the indicator that the system supports this WMI interface. The BFn class has a method named "DoBFn". This one lists all of the methods in the root/wmi namespace with the class that they are attached to. > Get-WmiObject -Namespace root/wmi -List | select _Path -Expand Methods | select Origin, Name, _Path
> Get-WmiObject -Namespace root/wmi -Class BFn I've done some PowerShell mucking around this area before, but my comfort level with the syntax isn't the greatest. I care a lot of about fan control so I have gotten it to a point where it is workable for my purposes, but I haven't been able to find time to finish a fully fleshed out release.) (This is a sort of hobby / side project for me. Regarding logging, I haven't fully built that out in Dell Fan Management but if you run it from the command line, you will get some text log entries dumped out there. Starting in 2021 (Tiger Lake systems) they removed the old interface that HWiNFO and other tools that can deal with Dell fans were using, so WMI is the only way to go now that I am aware of. I think any Dell system from 2018+ (maybe older), desktops included, supports the same WMI interface for reading the fan speeds. I did a lot of slinking around Dell's libsmbios C code (for Linux SMBIOS support), a lot of BIOS token/variable dumps, and some reverse-engineered Dell Power Manager code to figure this out. I am author of Dell Fan Management and I would be happy to pass along any information to help with this implementation.
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