I use a T630 as workstation. I followed the recommendations to silence it's fans via ipmitool and set the system.thermalsettings.ThirdPartyPCIFanResponse option to 0 because of the added gpu.
Today there was an unplanned power outage and after the power was restored the machine is louder than before. The minimum fan speed is set to 10% in iDRAC, but fans 1 and 2 runs at 16% and fan 3 - 6 at 31% permanently. If the fan speed is set to 10 % via ipmitool, the fans are slowing down to the previous level for only about 2 seconds, before going back to 16 and 31%. Did I miss something?

ipmitool-command:

$ ipmitool -I lanplus -H 192.168.0.2 -U root -P  raw 0x30 0x30 0x02 0xff 0x0a

Regards, Daniel