Limited Fan Control

[M4N14C]

CECHA01 running Evilnat 4.88.2.

It appears that there is something interfering/overwriting webMAN's fan control. I have my dynamic fan control set to 65. While idling in XMB it usually achieves this at around 25%-27%. However recently, usually around 10 min or so after booting up, the fan will kick up to 30%. Temps will drop into the 50's but no change in fan speed.
You can kind of hear the fan starting to ramp down, but then it picks back up again, like something is forcing it to maintain 30%.

Not sure where to start. First noticed this after exiting a PS2 game and the fan would not ramp down. Ever since it's been an ongoing/intermittent issue.

Solved.

For anyone having similar issues, apparently, there is a temp sensor for the south bridge chipset, and that can affect the fan curves.

I had drilled holes in my case, and while this kept my CPU/RSX nice and cool, the rest of the motherboard was not getting adequate cooling. Apparently, the southbridge chip was getting hot enough that it was overriding webMan's fan profile.

 

[sandungas]

Solved.

For anyone having similar issues, apparently, there is a temp sensor for the south bridge chipset, and that can affect the fan curves.

I had drilled holes in my case, and while this kept my CPU/RSX nice and cool, the rest of the motherboard was not getting adequate cooling. Apparently, the southbridge chip was getting hot enough that it was overriding webMan's fan profile.

Very interesting, if you take a look at the factory settings here we could deduce the temperature of the southbridge sensor was around 60ºC or 70ºC
https://www.psdevwiki.com/ps3/Syscon_Thermal_Config

Spoiler

Depends of the "p" step, but in general yeah... for COK-001 the "tempU" of the third fancontable (for southbridge) starts with 62ºC and probably when you was having the problem the sycon was using the values for "p5" or so

For curiosity sake, only the first PS3 motherboard models (COK-001, COK-002, SEM-001) have a temperature sensor in the south bridge
And the next motherboard models (DIA-001, DIA-002, DEB-001) doesnt have it, but the circuit in the motherboard is ready to add it... and the syscon firmware is able to monitor it too