Public bug reported: pwmconfig attempts to stop fans to determine whether it's possible to control fan speed. If fans don't respond to the stopping signal, pwmconfig assumes it's not possible to control the fans. However some motherboards or BIOS configurations seem to protect the fans from stopping, but it's still possible to set non-zero fan speeds. For example after sudo su I was able to echo 20 > /sys/class/hwmon/hwmon2/device/pwm1 which set a very slow fan speed and echo 120 > /sys/class/hwmon/hwmon2/device/pwm1 set a much higher speed - so obviously fan speed is working perfectly at least in this range. However if I try to set a very low value (between 0 and 17) the fan speeds up probably as a result of the mainboard or BIOS protection.
pwmconfig should take into account that sometimes (on some mobos or bioses) fan speed control is only possible in some range of speeds and/or stopping the fans is not always possible even though fan control works ** Affects: lm-sensors (Ubuntu) Importance: Undecided Status: New ** Tags: fancontrol pwmconfig -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to lm-sensors in Ubuntu. https://bugs.launchpad.net/bugs/1155107 Title: pwmconfig assumes no fan control from fans not stopping To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lm-sensors/+bug/1155107/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs