[Bugme-new] [Bug 20242] New: Thermal zone sensor reports 0°C , fan turns off, system overheats till it dies.

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=20242

           Summary: Thermal zone sensor reports 0°C, fan turns off, system
                    overheats till it dies.
           Product: ACPI
           Version: 2.5
    Kernel Version: 2.6.32 upwards
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Power-Thermal
        AssignedTo: acpi_power-thermal at kernel-bugs.osdl.org
        ReportedBy: jan_braun at gmx.net
        Regression: Yes


Created an attachment (id=33462)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=33462)
acpidump output

After a random uptime the thermal zone will report 0°C system temperature.
The fan immediately turns off.
The system will halt semiautomatically at above 110°C.

This behavior was introduced between Kernel versions 2.6.31 and 2.6.32. It is
persistent up to 2.6.36-rc6 and was introduced before or with commit
b963bd39c9000328f6ce4f12aa52abbb0c68ee91. (I have started testing using “git
bisect”, but as the time to thermal zone loss is arbitrary and can range from 5
Minutes to more than a week, I have difficulties marking any commit as good.)

No dependency on other conditions could be identified so far. Trying random
kernel boot flags from  other problem descriptions (e.g. acpi_osi,
acpi.power_nocheck, noapic and nolapic) did not improve the situation.

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