Re: thermal shutdown

[Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>]

Hi!

> It's known issue!

Well, its broken hw to start with.

> Pavel has the following solution. Let me know whether it works for you

The first hunk is really debugging hack, probably should
be dropped.
				Pavel

> --- clean/drivers/acpi/thermal.c	2004-02-05 01:54:00.000000000
> +0100
> +++ linux/drivers/acpi/thermal.c	2004-02-05 02:24:15.000000000
> +0100
> @@ -223,8 +223,11 @@
>  	tz->last_temperature = tz->temperature;
>  
>  	status = acpi_evaluate_integer(tz->handle, "_TMP", NULL,
> &tz->temperature);
> -	if (ACPI_FAILURE(status))
> +	if (ACPI_FAILURE(status)) {
> +		if (tz->temperature != tz->last_temperature)
> +			printk(KERN_ERR "temperature damaged while
> processing\n");
>  		return -ENODEV;
> +	}
>  
>  	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
> tz->temperature));
>  
> @@ -457,7 +460,17 @@
>  		return_VALUE(-EINVAL);
>  
>  	if (tz->temperature >= tz->trips.critical.temperature) {
> +		long old_temperature = tz->temperature;
>  		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Critical trip
> point\n"));
> +
> +		result = acpi_thermal_get_temperature(tz);
> +		if (!result) {
> +			if (tz->temperature <
> (tz->trips.critical.temperature - 100)) {
> +				printk(KERN_ALERT "ACPI changed its mind
> about temperature, was %ld C, now %ld C", 
> +
> KELVIN_TO_CELSIUS(old_temperature), KELVIN_TO_CELSIUS(tz->temperature));
> +				return_VALUE(0);
> +			}
> +		}
>  		tz->trips.critical.flags.enabled = 1;
>  	}
>  	else if (tz->trips.critical.flags.enabled)
> 
> 
> 
> > -----Original Message-----
> > From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org 
> > [mailto:acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of 
> > Jakob Praher
> > Sent: Wednesday, March 03, 2004 7:42 PM
> > To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> > Subject: [ACPI] thermal shutdown
> > 
> > 
> > hi,
> > 
> > my system: 2.6.3 acpi patched
> > 
> > I have noticed, that at some sudden point in time (especially 
> > when I am
> > not working actively ( I mean using input devices )), I receive a
> > thermal shutdown, because of a (false?) temperature value.
> > 
> > looking under /var/log/kern.log I found  
> > 
> > jaques2:/var/log# cat  kern.log | grep  Critical
> > Feb 19 16:11:21 jaques2 kernel: Critical temperature reached (123 C),
> > shutting down.
> > Feb 19 16:11:22 jaques2 kernel: Critical temperature reached (46 C),
> > shutting down.
> > Feb 20 10:47:02 jaques2 kernel: Critical temperature reached (123 C),
> > shutting down.
> > Feb 20 10:47:02 jaques2 kernel: Critical temperature reached (44 C),
> > shutting down.
> > Mar  2 22:38:27 jaques2 kernel: Critical temperature reached (123 C),
> > shutting down.
> > Mar  2 22:38:27 jaques2 kernel: Critical temperature reached (44 C),
> > shutting do
> > 
> > this temperature always happens to be 123 C.
> > How is that possible?
> > I noticed that the acpi_thermal_critical method uses some kind of flag
> > for enabled disabled, but apparently in any case the shutdown 
> > user space
> > app (/sbin/poweroff) is called.
> > Should this only be the case when the temperature is too high and the
> > flag (enabled) is set to != 0? Otherwise, what is the point in the
> > enabled thing. [tz->trips.critical.flags.enabled]
> > 
> > As you can see from my kern.log, the second value is 
> > drastically lower,
> > so could this be a weekness in the system, that one sporadically high
> > value can trigger a shutdown?
> > 
> > thanks
> > -- Jakob
> > 
> > 
> > 
> > 
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> 
> 
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