More often than not, when my laptop is resumed after being suspended, the fan will no longer spin, resulting in overheating when a heavy process is running.
This happens on Ubuntu 14.04 with 3.13.0 and 3.19.0 kernels.
I had no fan problems on Ubuntu 12.04 with a 3.5.0 kernel.
A reboot (soft or hard) always starts the fan again.
Something which sometime works:
Shutting the lid and waiting for some time. When I return and unsuspend the machine, and make it hot, sometimes the fan will start working again!
(Although then it never stops spinning, even when the temperature drops low.)
Things I have tried which have no effect:
sensors-detectfrom the lm-sensors cannot find anything beyond
fancontrolservice does not start because
pwmconfigfinds nothing to work with
- Kernel options
acpi=offcaused the machine to boot with no fan and various other stuff missing
- Flashed the BIOS to latest firmware
- Installed latest
sensorslists three temperatures but no fan speeds.
acpi -cilists three entries (intel_powerclamp, and two processors) but the values rarely seem to coincide with what I'm hearing
- What else has changed that I could try disabling, either changes in the kernel since 3.5.0, or in Ubuntu between 12.04 and 14.04?
Edit: One other thing about my system. When moving from 12.04/3.5.0 to newer kernels, I had to go into the BIOS and change "OS Selection" from "Windows 8" to "Windows 7" in order for bootup to complete.