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If your fan speed is automatically set to, say, 40% at 35C, it will not be further decreased until (35C-hysteresis) is reached. IMHO, a 10C hysteresis value is a bit too large. You should check to see when SpeedFan has actually "changed" the PWM value because the hysteresis is applied to that value. That said, the BIOS might be interfering. |
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hysteresis.png (7,436 bytes) |
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Well, I dont think the PWM is actually working well on the DELL laptop. 34% is the min. where fans still spin, the next higher spin is reached at 0000019:0000070% and then 100%, so there are 3 steps rather than a proper PWM ramp ... :-( Beside the PWM value is dropped from 34% to 0% (in a single step) once 46C is reached: Exactly as advertised by my curve. I attach the curve I programmed for this above. The question remains: How do you stop the BIOS interference so the Hysteresis works properly? |
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I see that you have a DELL where only the DELL interface is working. Since it allows only for 3 different levels, you can't rely on a fine grained control. You should be aware of the hardware limits of fan control on your system and find the way to get the best out of it. |
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Thank you. I really hope the mouse issue is resolved soon, otherwise speedfan cannot be used at all on those DELL laptops: http://www.bugtrack.almico.com/view.php?id=1955 |
- Anonymous
