Full-speed or Disengaged or 64 is accepted by thinkpad_acpi, but when put on thinkfan.conf yaml, the service exit with error, Unrecognized fan level string

[benyaminl]

Hello, I just want to ask, does the thinkfan yaml level only support text? I want to put disengaged or full-speed as last resort to drop the cpu temp, but seems with 64, full-speed, always error Unrecognized fan level string or Your highest fan level is 64, but fan levels greater than 7, but if I put it manually using
echo level 64 | sudo tee /proc/acpi/ibm/fan, it works perfectly. Is there any work around or I seen it wrong?

I already look or read the man thinkfan.conf, but seems it doesn't answer my question, and 255 also out of range, any pointer is appreciated. Thank you!

[benyaminl]

Ok, I found the answer, I add -D into the configuration on thinkpad.service, so it just bypass the level. I seen it on man thinkfan. seems that's the only way :/