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Date: Mon, 17 Apr 2006 20:00:57 +0200
From: Marcin Koziej <creep@desk.pl>
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Subject: Acpi thermal/powerd not keeping up.
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Hello,

I use STABLE with acpi_perf and powernow module on Athlon64 cpu with 
Cool`n'Quiet. I have two problems I'd like to ask advice for:

1. Is there a way to improve time frequency of temp zones' temperature 
info ? On heavy load I can get over 10 deg. jump with which powerd 
cannot keep up (I use patched version which tries to use passive cooling 
(drop cpu freq) when temperature is too high).

2. If I start the system after overheating shutdown, the system heats up 
again, because the passive cooling can only start after the kernel has 
boot'ed. If the partitions are fsck'ed, it can get even worse.

Thoughts appreciated,

m.

From owner-freebsd-acpi@FreeBSD.ORG  Wed Apr 19 01:13:13 2006
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Date: Tue, 18 Apr 2006 21:12:47 -0400
From: "Alexandre \"Sunny\" Kovalenko" <Alex.Kovalenko@verizon.net>
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Subject: Re: Acpi thermal/powerd not keeping up.
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On Mon, 2006-04-17 at 20:00 +0200, Marcin Koziej wrote:
> Hello,
> 
> I use STABLE with acpi_perf and powernow module on Athlon64 cpu with 
> Cool`n'Quiet. I have two problems I'd like to ask advice for:
> 
> 1. Is there a way to improve time frequency of temp zones' temperature 
> info ? On heavy load I can get over 10 deg. jump with which powerd 
> cannot keep up (I use patched version which tries to use passive cooling 
> (drop cpu freq) when temperature is too high).
> 
> 2. If I start the system after overheating shutdown, the system heats up 
> again, because the passive cooling can only start after the kernel has 
> boot'ed. If the partitions are fsck'ed, it can get even worse.
> 
> Thoughts appreciated,
> 
> m.
> _______________________________________________
> freebsd-acpi@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-acpi
> To unsubscribe, send any mail to "freebsd-acpi-unsubscribe@freebsd.org"

You have not provided too much detail on your thermal zone
configuration, but, assuming you have one defined, you should be able to
set

hw.acpi.thermal.polling_rate

to the desired frequency (in seconds). I honestly do not remember where 
does default (10 seconds on my system) come from.

I have seen (2) on my laptop as well, but this was the result of
hardware problem -- heatsink not aligned well with the CPU. After using
crowbar and some thermal grease on it the problem disappeared.

HTH,
-- 
Alexandre "Sunny" Kovalenko (Олександр Коваленко)