I put an LT in my PC to extend the fan channels to 8 and allow more granular control of noise, however I've run into an odd issue with the LT, channel 8 seems to be stuck in PWM mode despite it apparently not being supported while running as a slave.

So the 8th fan channel tries to adjust down but stays at 100% always as it's not a PWM fan (standard 3 pin fan).

I've attached an image showing the issue, power at 35%, voltage remains at 12V and fan going full power (you can see my other fans are correctly operating in speed mode).

Anyone know how I can fix this?

So, I reset the LT and it works fine in normal operating mode.

Reflashed the slave firmware and the problem is solved.