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Re: New Jessie Install: Laptop fan doesn't run

I've done some more research, and it appears that the fan control is only happening at boot, in *both* the installed system and the livecd. So if the machine is hot at boot, the fan runs and stays running regardless of temperature changes. If the machine is cool at boot, the fan doesn't run, regardless of temperature changes.

I've discovered interesting behavior with the sensors command and acpi -t.

Sensors currently shows:
   Adapter: Virtual device
   temp1:        +40.0°C  (crit = +100.0°C)     <----- This never changes after boot

   Adapter: ISA adapter
   Core 0:       +56.0°C  (high = +100.0°C, crit = +100.0°C)
   Core 1:       +57.0°C  (high = +100.0°C, crit = +100.0°C)

However acpi -t shows:
   Thermal 0: ok, 40.0 degrees C

The temp1 line reported by sensors never changes after boot, and neither does the output from acpi -t. So it looks like acpi is looking at the wrong temperature, as it's only the Core 0 and Core 1 temperatures that change.

On 2015-05-02 10:02, Glen Reesor wrote:
Some more information...

I have confirmed that the fan runs when the Jessie livecd is running, but the fan doesn't run for amd64 or i386 installations. I've compared syslog, daemon.log, and lsmod and found:

syslog: Both livecd and amd64 installation have these lines:
    kernel: [    0.020564] CPU0: Thermal monitoring enabled (TM1)
    kernel: [    0.943898] thermal LNXTHERM:00: registered as thermal_zone0
    kernel: [    0.943904] ACPI: Thermal Zone [TZ01] (50 C)

syslog: There is a slight difference in the following line:
   livecd: kernel: [    3.144083] acpi device:3a: registered as cooling_device0
   amd64: kernel: [    8.712124] acpi device:3a: registered as cooling_device2

lsmod has slight differences:
   livecd: thermal                17343  0
              thermal_sys            27122  3 video,thermal,processor

   amd64: thermal                17559  0
                thermal_sys            27642  3 video,thermal,processor     

In daemon.log, the amd64 installation has the following lines (but they may be the result of installing the sensors package,
which the livecd does not have):
      May  2 08:36:48 amd64 sensors[492]: acpitz-virtual-0
      May  2 08:36:48 amd64 sensors[492]: Adapter: Virtual device
      May  2 08:36:48 amd64 sensors[492]: temp1:         +0.0°C  (crit = +100.0°C)
      May  2 08:36:48 amd64 sensors[492]: coretemp-isa-0000
      May  2 08:36:48 amd64 sensors[492]: Adapter: ISA adapter
      May  2 08:36:48 amd64 sensors[492]: Core 0:       +25.0°C  (high = +100.0°C, crit = +100.0°C)
      May  2 08:36:48 amd64 sensors[492]: Core 1:       +26.0°C  (high = +100.0°C, crit = +100.0°C)

Any help would be greatly appreciated.


On 2015-04-30 20:40, Glen Reesor wrote:
I have done a fresh install of Jessie on an old Acer laptop and the fan never runs, so it overheats. Interestingly, the fan *does* run while Jessie is being installed.

Has anyone had similar problems? Does anyone have suggestions on how to diagnose this?

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