While the it87 chip supports PWM control, the driver does not yet support it. And the driver reinitializes the chip, unfortunately without any way to disable this. The fan_minx files control the alarm threshold, not the fan speed. Until PWM support is added, you may wish to comment out everything in it87_init_client() to disable reinitialization. mds ?ric Brunet wrote: > Hi, > > I have a shuttle XPC SB51G with only one fan. In the bios, you can set > this fan to run in ``Autoguardian mode'': it is running at 2000 rpm below > a certain temperature or at 3000 noisy rpm above. The computer never > reached this critical temperature so I am always working with the nearly > silent 2000 rpm mode. However, it is not silent enough, and my plan is to > shut down completely this fan and set the processor to run at one tenth > of its frequency. Most of the time (for instance at night), it would be > enough and extremely silent. > > I have tried to shut down the fan with acpi, but to no avail. Recently, > I have compiled a 2.5.70 kernel with sensors modules. > > The funny thing is that the mere fact of loading the modules (chip it87, > bus i2c_i801) set my fan in the noisy mode: it gets immediatly to 3000 > rpm when the modprobe returns. > > I have looked at the files in the /sys filesystem. I have: > > fan_div1 2 > fan_div2 2 > fan_div3 2 > fan_input1 0 > fan_input2 0 > fan_input3 3668 > fan_min1 3000 > fan_min2 3000 > fan_min3 3000 > > I can set fan_min3 to a lower value, but the fan won't slow down. > Removing the modules won't do anything either. I was disapointed that no > pwm[1-3] files (as advertised in <kernel source>/Documentation/i2c/sysfs-interface) show up in the sysfs. > > So my questions are: > > is it normal that just loading a module change my fan's behaviour ? > is it a bug ? Can I prevent it ? > once loaded, can I go back to the previous nearly-silent mode at > 2000 rpm ? Right now, the only way seems to reboot... > can I more generally set an arbitrary fan speed and eventually > shut down completely the fan ? > > Thank you for your help. > > ?ric Brunet >
