thermal zone causing insta-reboot on bootup of 2.6.3

thermal zone causing insta-reboot on bootup of 2.6.3

[Oisín Mac Fhearaí]

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After installing the 2.6.3 kernel on Mandrake 9.2 on an Acer Aspire 1705SMi laptop, my machine repeatedly prints "Critical temperature reached (255 C), shutting down." and reboots.
Installing the 20040220 patch to it seems to have made no difference (and added no options that I could see to "make menuconfig" - in fact it removed the options for relaxed something under the ACPI options page, which wasn't doing anything anyway)...

Can anyone advise? I'm quite inexperienced with linux, so I might be doing something stupid (also, I'm having trouble finding which boot messages are kept in which logfiles...).
I'm too scared by the "might damage your CPU" message to remove thermal zone from the kernel ACPI settings.

Oisín

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Re: thermal zone causing insta-reboot on bootup of 2.6.3

[Len Brown]

if you delete the thermal module, this failure will go away
(and so will our ability to debug it;-)

perhaps you can file a bug at bugzilla.kernel.org
category: ACPI
component: Power-Thermal

and attach the output from dmesg -s40000 with thermal installed.

clearly we're getting a bogus temperature reading.

thanks,
-Len

On Wed, 2004-03-10 at 19:37, Oisín Mac Fhearaí wrote:
> After installing the 2.6.3 kernel on Mandrake 9.2 on an Acer Aspire
> 1705SMi laptop, my machine repeatedly prints "Critical temperature
> reached (255 C), shutting down." and reboots.
> Installing the 20040220 patch to it seems to have made no difference
> (and added no options that I could see to "make menuconfig" - in fact
> it removed the options for relaxed something under the ACPI options
> page, which wasn't doing anything anyway)...
>  
> Can anyone advise? I'm quite inexperienced with linux, so I might be
> doing something stupid (also, I'm having trouble finding which boot
> messages are kept in which logfiles...).
> I'm too scared by the "might damage your CPU" message to remove
> thermal zone from the kernel ACPI settings.
>  
> Oisín



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RE: thermal zone causing insta-reboot on bootup of 2.6.3

[Yu, Luming]

The following patch is from Pavel, and maybe it is suitable for this case. --Luming

--- 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 
> Brown, Len
> Sent: Thursday, March 11, 2004 3:02 PM
> To: Oisín Mac Fhearaí
> Cc: ACPI Developers
> Subject: Re: [ACPI] thermal zone causing insta-reboot on 
> bootup of 2.6.3
> 
> 
> if you delete the thermal module, this failure will go away
> (and so will our ability to debug it;-)
> 
> perhaps you can file a bug at bugzilla.kernel.org
> category: ACPI
> component: Power-Thermal
> 
> and attach the output from dmesg -s40000 with thermal installed.
> 
> clearly we're getting a bogus temperature reading.
> 
> thanks,
> -Len
> 
> On Wed, 2004-03-10 at 19:37, Oisín Mac Fhearaí wrote:
> > After installing the 2.6.3 kernel on Mandrake 9.2 on an Acer Aspire
> > 1705SMi laptop, my machine repeatedly prints "Critical temperature
> > reached (255 C), shutting down." and reboots.
> > Installing the 20040220 patch to it seems to have made no difference
> > (and added no options that I could see to "make menuconfig" 
> - in fact
> > it removed the options for relaxed something under the ACPI options
> > page, which wasn't doing anything anyway)...
> >  
> > Can anyone advise? I'm quite inexperienced with linux, so I might be
> > doing something stupid (also, I'm having trouble finding which boot
> > messages are kept in which logfiles...).
> > I'm too scared by the "might damage your CPU" message to remove
> > thermal zone from the kernel ACPI settings.
> >  
> > Oisín
> 
> 
> 
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> Acpi-devel mailing list
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> 


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Re: thermal zone causing insta-reboot on bootup of 2.6.3

[Pavel Machek]

Hi!

> The following patch is from Pavel, and maybe it is suitable for this
> case. --Luming

Probably not. In my case, sensor randomly lies. In his case, it seems
to report 255 all the time...
								Pavel

> @@ -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)
> 
>   
> 

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Re: thermal zone causing insta-reboot on bootup of 2.6.3

[Pavel Machek]

Hi!

>    I'm too scared by the "might damage your CPU" message to remove
>    thermal zone from the kernel ACPI settings.

If your machine is ACPI-compliant, it will poweroff itself, not damage
cpu...
								Pavel
-- 
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