http://bugzilla.kernel.org/show_bug.cgi?id=5534





------- Additional Comments From [EMAIL PROTECTED]  2006-03-25 01:02 -------
I can still reproduce the problem.

A description of my kernel can be found at
http://www.ceiriog.eclipse.co.uk/2.6.16-prw7

My kernel configuration (.config) can be found at
http://www.ceiriog.eclipse.co.uk/dot-config-2.6.16-prw7

Additional patches mentioned in the kernel description can be found at
http://gaugusch.at/acpi-dsdt-initrd-patches/acpi-dsdt-initrd-v0.7e-2.6.14.patch
http://www.suspend2.net/
and in the directory
http://www.ceiriog.eclipse.co.uk/patches

I find that full ACPI debugging gives me too much information, so I have
prepared a small patch which will show you the flow of control
http://www.ceiriog.eclipse.co.uk/patches/acpi_events.patch

In order to reproduce the problem reliably you need to turn thermal
zone polling OFF with
echo 0 > /proc/acpi/thermal_zone/TZ1/polling_frequency.
You also need to turn off any application which is reading the
temperature /proc/acpi/thermal_zone/TZ1/temperature.
You might also want to enable some limited ACPI debugging with
echo 0x0f > /proc/acpi/debug_level.

Then run a CPU-intensive application (glxgears will do it eventually,
so will a kernel compilation). You may monitor the temperature using
watch "cat /proc/acpi/thermal_zone/*/temperature", but kill this
process just before the temperature reaches 65C. Wait a while until
you are confident that the temperature has exceeded 65C. Then do
"acpi -t" or "cat /proc/acpi/thermal_zone/*/temperature" and you should
find (1) the system seems to hang for a fraction of a second (or several
seconds if it is a long time since the trip point was exceeded) and (2)
you get something in the system log like
http://www.ceiriog.eclipse.co.uk/patches/messages

Note how the thermal notify events Notify (\_TZ.TZ1, 0x80) are repeatedly
queued and never processed until after "acpi -t" causes the evaluation of
_TMP.

Peter Wainwright



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