Hi Jean, I don't think I ever thanked you for this helpful reply. It's summer again, and I'm getting annoyed by my laptop fan again, and I had cause to re-read your email. Thanks. Dan Jean Delvare <khali at linux-fr.org> writes: > Hi Dan, > > On Sun, 23 Nov 2008 20:38:30 -0500, Dan Davison wrote: >> pwmconfig fails with the message >> >> /usr/sbin/pwmconfig: There are no pwm-capable sensor modules installed >> >> Looking at the pwmconfig shell-script, the error occurs because there are no pwm* files in the relevant place: >> >> ~> ls /sys/class/hwmon/hwmon*/device/ >> /sys/class/hwmon/hwmon1/device/: >> driver hwmon modalias name power subsystem temp1_crit temp1_crit_alarm temp1_input temp1_label uevent >> >> /sys/class/hwmon/hwmon2/device/: >> driver hwmon modalias name power subsystem temp1_crit temp1_crit_alarm temp1_input temp1_label uevent >> >> >> However, despite a few hours googling, I am unclear whether there is >> any hope that I can get this working, and if so what to do next. This >> is a Fujitsu-Siemens Lifebook S Series laptop which has the an Intel >> Core Duo processor with Intel 945GM chipset, and is running Ubuntu >> Intrepid (fully updated). > > On most recent laptops, thermal management is handled by ACPI. No > hardware monitoring chips are exposed to the OS and thus software-based > fan speed control is not possible (and most often not desirable either > - the ACPI-based control should work just fine.) > >> I've looked at http://www.lm-sensors.org/wiki/Devices, but don't fully >> understand the information there. Under SENSOR CHIP DRIVERS there is >> this entry >> >> Intel Core, Core 2 yes coretemp 2.6.22 (2007-03-25) Integrated sensor in CPU. Driver contributed by Rudolf Marek. >> >> Is this good news, or is it saying that there's just temperature stuff >> but no fan control? > > The coretemp driver lets you read the CPU temperature value of Intel > Core and later CPU models. It is not a hardware monitoring chip driver, > so, no fan speed readings nor control. > >> and under I2C/SMBUS BUS DRIVERS there are several entries for Intel >> none of which obviously correspond to my hardware. >> >> I've run sensors-detect which results in (full output at bottom) >> >> Driver `smartbatt' (should be inserted): > > FWIW, the smartbatt driver is a legacy thing for Linux 2.4. I seem to > remember that ACPI is taking care of this now (at least on some laptop > models). The ACPI driver is named sbs. We should no longer recommend > the smartbatt driver. > >> Detects correctly: >> * Bus `SMBus I801 adapter at 18e0' >> Busdriver `i2c-i801', I2C address 0x0b >> Chip `Smart Battery' (confidence: 5) >> >> Driver `coretemp' (should be inserted): >> Detects correctly: >> * Chip `Intel Core family thermal sensor' (confidence: 9) >> >> This coretemp module is loaded and is providing temperature >> readings. I don't know if it has anything to do with fan control. > > No, it doesn't. It is a simple temperature-only driver. > >> >> Running sensors gives >> >> ~> sensors >> acpitz-virtual-0 >> Adapter: Virtual device >> temp1: +26.8?C (crit = +100.0?C) >> temp2: +26.8?C (crit = +100.0?C) >> >> coretemp-isa-0000 >> Adapter: ISA adapter >> Core 0: +43.0?C (crit = +100.0?C) >> >> coretemp-isa-0001 >> Adapter: ISA adapter >> Core 1: +43.0?C (crit = +100.0?C) >> >> >> (I have not observed the first two temperatures be anything other than >> 26.8). > > These are the ACPI temperatures, if they never change, this suggests > that the ACPI implementation of your laptop is broken. Upgrading the > BIOS might help. As a side note, the value 26.8 itself is pretty > suspicious, considering that 26.8 + 273.2 (the difference between the > degree C and Kelvin scales) == 300. > >> I'd like to be able to modify my fan behaviour but don't know what to >> do in order that pwmconfig runs. Thanks very much for any help. Full >> output from sensors-detect follows. > > pwmconfig will most likely never work on your system, sorry. If you > need to control your fans, and if this can indeed be done, this will > either be done through ACPI, or through a laptop-specific kernel driver.
