Hi Stefan, (Replying to everyone on the list, sorry!) On 8/10/07, Stefan Richter <stefanr at s5r6.in-berlin.de> wrote: > Should I hardwire correct dividers or pulse per rev in sensors.conf or > is the driver supposed to work the correct dividers out --- like it did > before 2.6.23-rc? The dividers are read-only in userspace. The driver manages the dividers automatically. The dividers are needed because the w83627ehf chip only has an 8 bit register to count pulses for each fan. So if the fan is moving slowly, you want the divider to be 128 so that every pulse gets counted. If the fan is moving fast, you want the divider to be 1 so that the register doesn't overflow. Once the register is read in by the driver, the effect of the divider is cancelled out in software so that you get an RPM reading from the fan. One side effect of this is that a fast moving fan reports the RPM more quickly than a slow moving fan. If you turn on HWMON debugging, the driver will report when it is changing the divider in dmesg. Hope that helps, David
