Public bug reported:
Because of thermal problems, my notebook suddenly shutdown and I lost
all my work.
The cause was that ACPI thermal zone reached CRITICAL level, and the
kernel call's /sbin/poweroff:
-------~/src/linux/linux-source-2.6.20-2.6.20/drivers/acpi/thermal.c
[..]
#define ACPI_THERMAL_PATH_POWEROFF "/sbin/poweroff"
[..]
static int acpi_thermal_critical(struct acpi_thermal *tz)
{
if (!tz || !tz->trips.critical.flags.valid)
return -EINVAL;
if (tz->temperature >= tz->trips.critical.temperature) {
printk(KERN_WARNING PREFIX "Critical trip point\n");
tz->trips.critical.flags.enabled = 1;
} else if (tz->trips.critical.flags.enabled)
tz->trips.critical.flags.enabled = 0;
printk(KERN_EMERG
"Critical temperature reached (%ld C), shutting down.\n",
KELVIN_TO_CELSIUS(tz->temperature));
acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
tz->trips.critical.flags.enabled);
acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
return 0;
}
-------~/src/linux/linux-source-2.6.20-2.6.20/drivers/acpi/thermal.c
HOW TO REPRODUCE:
1.a Keep your notebook/hardware unclean ;) and do some cpu stress
1.b Increase the trip_point to a minor level. Ex:
# cat /proc/acpi/thermal_zone/THM/temperature
temperature: 53 C
# echo -n "50:0:0:0:0" > /proc/acpi/thermal_zone/THM/trip_points
2. Watch your notebook shutting down with no warning or futher action
RECOMMENDATION:
1. Change the thermal.c module for calling a script. This script may check if
acpid is working, if it is not active, THEN call poweroff
2. Add an acpid script int /etc/acpi for taking care of the process. This
script may call gnome-power-manager for asking the user to suspend to disk/ram.
The script may also slow down the cpu frequency, if possible.
Cheers,
--
Aldrin Martoq
** Affects: Ubuntu
Importance: Undecided
Status: Unconfirmed
--
acpi critical thermal zone call poweroff insteand of suspend to disk or ram,
results in lost of work
https://bugs.launchpad.net/bugs/113926
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