HP 6730b and fan at full speed after suspend (Fedora, Ubuntu, openSUSE)

It seems that with kernels 3.9 onwards there are some issues with fan speed and the 6730b model of HP notebook. I tried with Fedora 22 (my main distribution of choice), openSUSE Tumbleweed and Ubuntu 15.04.

The problem occurs only when the system is woken up after a sleep/suspend: fans spin at full speed indefinitely, without resort (apart from reboot/shutdown). This is a problem with ACPI. In order to solve this problem, if you’re using Fedora like me, create the file /etc/pm/sleep.d/99fancontrol.sh and fill it with the following:

case "$1" in
# Stopping is not required.
# In background.
ls /sys/devices/virtual/thermal/cooling_device*/cur_state | while read A; do echo 1 > $A; echo 0 > $A; done
*) exit $NA

and of, course, set it executable with chmod +x.

It basically flips on and off the current state of the cooling devices: with this script you won’t have the noisy fans at full speed on resume.

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