On Thu, 28 Jun 2012 12:21:40 -0400, Arun Raghavan wrote: > On Thu, Jun 28, 2012 at 2:31 AM, Jean Delvare <khali@xxxxxxxxxxxx> wrote: > > 1000 RPM is a relatively common value for the minimum speed of CPU > > fans, so I'm not surprised by your observations. If this is too much > > for you, you have to either lower the input voltage to the fan, or use > > a different model altogether. > > Thanks, that makes sense. Can I control the input voltage through > software/some sysfs attribute or do I have to do it from the supply? You have to hack it physically, typically by adding a serial resistor. Some vendors ship such adapters with their fans. I got mine from Noctua but these are 3-pin, not 4-pin ones so it wouldn't help you. Zalman also has 3-pin model [1] but apparently no 4-pin model :( [1] http://www.zalman.com/ENG/product/Product_Read.asp?idx=223 If there's a way to reduce the voltage by software, it would be totally board specific (using a custom DAC device) and not supported. -- Jean Delvare _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
