http://bugzilla.kernel.org/show_bug.cgi?id=9432
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------- Comment #23 from [EMAIL PROTECTED] 2008-05-20 00:33 -------
(In reply to comment #22)
> I'm also having this issue, it seems. Kernel is 2.6.24-gentoo-r3.
Count me in as vexed by this one, as well as a bunch of Ubuntu users. This
problem has been reported over on their side since at least 2.6.20. The
inability to turn off the fan leads to a kacpi/kacpi_notify runaway.
You can find one of the longer Ubuntu bug reports here:
https://bugs.launchpad.net/ubuntu/+source/acpi/+bug/75174
This is my best guess for what's going on.
1.) Some load heats up the CPU enough for the fan to kick in.
2.) The fan does it's job and the CPU cools enough for the kernel to decide
it's time to turn it off.
3.) ACPI tries and fails to turn off the fan. A lot. And tries to blog about it
via klogd.
4.) CPU temp increases. ACPI takes things personal and *keeps* trying to turn
the fan off.
5.) Profit!
On CPU's that support throttling, this sequence can be short-circuited by
throttling down the CPU. My ill-informed guess is that once the temp gets low
enough, the BIOS is shutting off the fan, at which point ACPI stops trying to
do so.
If I understand the way fan control is supposed to work, you can test this by
writing 0 (on) and 3 (off) to /proc/acpi/fan/$FAN/state. In my case I can turn
it on, but attempts to turn it off result in a write error.
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