thinkpad_acpi fan stop working problem (was after resume) (speed becomes 65535)

thinkpad_acpi fan stop working problem (was after resume) (speed becomes 65535)

[r ll]

To THINKPAD ACPI EXTRAS DRIVER authors and related mailer list,

(got this list from MAINTAINERS and thinkpad_acpi.c)


This problem occasionally happens on my Thinkpad T410 with some recent kernels,
I remember this problem since 2.6.35 when I was installing Ubuntu-10
and now I have switched to Arch Linux with self complied latest
3.4-rc5, this issue
is remaining there,

most of time the fan is working well, but usually every night I close the laptop
let the Linux suspend; then resume on next morning, occasionally the laptop
could become very hot, usually above 90℃ for long time, if I compile something
or do some heavy work, it may go up over 128℃ then machine
automatically shutdown,

# cat /sys/devices/platform/thinkpad_hwmon/temp1_input
97000
# cat /sys/devices/platform/thinkpad_hwmon/fan1_input
65535

I guess the fan is actually not working at all;
I tried unload & reload the kernel module but it still doesn't work;
I tried manually set a speed level but it's still 65535, the machine
is still hot

# modprobe -r thinkpad_acpi && modprobe thinkpad_acpi fan_control=1

# echo 'level full-speed' >/proc/acpi/ibm/fan
# cat /proc/acpi/ibm/fan
status:		enabled
speed:		65535
level:		disengaged
commands:	level <level> (<level> is 0-7, auto, disengaged, full-speed)
commands:	enable, disable
commands:	watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))


It seems the only way is to complete power off Linux for a few
seconds, power on again
then the fan could be working, I observed a normal speed should be
between 3000 ~ 5000, and machine temperature is 40~70℃, normally working;


Wonder if someone experienced same problem and how can we fix it?



at least to know how can I recover the fan to work, without rebooting



Thanks,

Re: thinkpad_acpi fan stop working problem (was after resume) (speed becomes 65535)

[Henrique de Moraes Holschuh]

On Wed, 02 May 2012, r ll wrote:
> most of time the fan is working well, but usually every night I close the laptop
> let the Linux suspend; then resume on next morning, occasionally the laptop
> could become very hot, usually above 90℃ for long time, if I compile something
> or do some heavy work, it may go up over 128℃ then machine
> automatically shutdown,
> 
> # cat /sys/devices/platform/thinkpad_hwmon/temp1_input
> 97000
> # cat /sys/devices/platform/thinkpad_hwmon/fan1_input
> 65535

"-1" (reported as 65535) *is* the standard ThinkPad EC lingo for "not
available".  Getting this in the tachometer is really weird, but
actually useful :p  It is also the first time I've ever heard of this.

Change your kernel to disable thinkpad-acpi fan control, i.e. make
*sure* thinkpad_acpi is always loaded with fan_control=0, even at the
first time it is loaded.  You might need to mess with /etc/modprobe.d,
and maybe even update your initramfs.

Run it like that for a while, so that you can access whether the problem
went away or not.  Let's find out whether it is thinkpad-acpi or
something else that is getting the EC pissed off :-)

> I tried unload & reload the kernel module but it still doesn't work;
> I tried manually set a speed level but it's still 65535, the machine
> is still hot

So, whatever it is, it makes the EC ignore fan control commands.

Are you using the "fan" ACPI module?

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

Re: thinkpad_acpi fan stop working problem (was after resume) (speed becomes 65535)

[r ll]

On Sun, May 6, 2012 at 7:06 PM, Henrique de Moraes Holschuh
<hmh@hmh.eng.br> wrote:
> On Wed, 02 May 2012, r ll wrote:
>> most of time the fan is working well, but usually every night I close the laptop
>> let the Linux suspend; then resume on next morning, occasionally the laptop
>> could become very hot, usually above 90℃ for long time, if I compile something
>> or do some heavy work, it may go up over 128℃ then machine
>> automatically shutdown,
>>
>> # cat /sys/devices/platform/thinkpad_hwmon/temp1_input
>> 97000
>> # cat /sys/devices/platform/thinkpad_hwmon/fan1_input
>> 65535
>
> "-1" (reported as 65535) *is* the standard ThinkPad EC lingo for "not
> available".  Getting this in the tachometer is really weird, but
> actually useful :p  It is also the first time I've ever heard of this.
>
> Change your kernel to disable thinkpad-acpi fan control, i.e. make
> *sure* thinkpad_acpi is always loaded with fan_control=0, even at the
> first time it is loaded.  You might need to mess with /etc/modprobe.d,
> and maybe even update your initramfs.

Once boot, I see it's "N", is it not enough to make sure?
I always compile in the hdd drivers and filesystem code for root, so
not using an initramfs;
this thinkpad_acpi module is just loaded automatically by some init script,
and my /etc/modprobe.d is empty, I'm using modprobe by kmod 7-2;

$ cat /sys/module/thinkpad_acpi/parameters/fan_control
N
$ cat /sys/devices/platform/thinkpad_hwmon/fan1_input
3578
$ pacman -Q |grep kmod
kmod 7-2



>
> Run it like that for a while, so that you can access whether the problem
> went away or not.  Let's find out whether it is thinkpad-acpi or
> something else that is getting the EC pissed off :-)
>
>> I tried unload & reload the kernel module but it still doesn't work;
>> I tried manually set a speed level but it's still 65535, the machine
>> is still hot
>
> So, whatever it is, it makes the EC ignore fan control commands.
>
> Are you using the "fan" ACPI module?

Do you mean this CONFIG_ACPI_FAN ? I found it's Y, but I can try disable it;
but do you think it's conflict with thinkpad_acpi fan ?

$ grep -i fan /boot/config
CONFIG_ACPI_FAN=y


>
> --
>  "One disk to rule them all, One disk to find them. One disk to bring
>  them all and in the darkness grind them. In the Land of Redmond
>  where the shadows lie." -- The Silicon Valley Tarot
>  Henrique Holschuh



-- 
Cheng Renquan (程任全)