Ticket #2350 (closed defect: wontfix)
AS99127F PWM Fan Control Experiment on P3B-F
|Reported by:||ticket||Owned by:||khali|
Description (last modified by khali) (diff)
I conducted some experiment on Asus P3B-F motherboard with AS99127F (Ver. 1).
I confirm that 0x59 register control the CPU_Fan Header on this motherboard, and 0x5a register control PWR_Fan.
In order to reduce the dependency of specific fan, the measurement is conducted with a digital scope without fan connected. I found out that P3B-F actually output variable DC voltage on fan header center pin, looks like PWM is filtered on this motherboard.
Here are some of measurements:
0x80 20 mV 0x81 20 mV 0x82 232 mV 0x83 1.2V 0x84 2.31V 0x85 3.44V 0x86 4.62V 0x87 5.81V 0x88 7.01V 9x89 8.22V 0x8a 9.42V 0x8b 10.6V 0x8c 11.9V 0x8d 12.4V 0x8e 12.4V 0x8f 12.4V
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