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Gaming-ITX/ac fan control not working

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x6phenom View Drop Down
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    Posted: 02 Feb 2016 at 10:05pm
Hello,

I have three fans:
SYS
CPU
AUX

I am able to control CPU and AUX, but not SYS. Is this intended or a fault in the motherboard?

I opened my chassis to see which header corresponds to which signal:

CPU_FAN1 = CPU (can control)
CHA_FAN1 = AUX (can control)
CHA_FAN2 = SYS (control not working)

What should I do? Is this a BIOS or HW fault?

I used both SpeedFan and F-Stream to test.
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x6phenom View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote x6phenom Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2016 at 11:03pm
Updated from BIOS 1.7 to 1.8

SYS / CHA_FAN2: control still not working



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tmorris View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote tmorris Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2016 at 1:35am
I ran into the same issue.  Are you using 3-pin or 4-pin (PWM) fans.  I found that the CHA_FAN2 pin ran at full speed for voltage but worked if using a PWM fan.  Then I found this in the on-line specifications:
 
"CPU_FAN1 and CHA_FAN1 can auto detect if 3-pin or 4-pin fan is in use."
 
I think the first two can do both but the third can only control a PWM fan.
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x6phenom View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote x6phenom Quote  Post ReplyReply Direct Link To This Post Posted: 03 Feb 2016 at 3:38am
All three are 3 pin connectors. Its so weird.. why would they even do this? I had to move my radiator fans to CPU_FAN and CHA_FAN1 and move my pump head connecter to the CHA_FAN2 (which doesnt control and runs at max always).

The problem is configuring fan profiles in BIOS. Since CPU_FAN1 responds to ? (CPU temp presumably) and the CHA_FAN1 can be configured for either motherboard or CPU. But when I set simialar fan profile settings, the CPU_FAN1 is always running at a lower speed than the CHA_FAN1 (no matter if I make it respond to motherboard or CPU temp).

It as pretty frustrating, eventually gave up and decided to use SpeedFan.
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