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Date: Sun, 4 Apr 2010 01:59:21 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Bartosz Fabianowski <freebsd@chillt.de>
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Cc: freebsd-acpi@freebsd.org
Subject: Re: Spurious thermal shutdowns on Dell Studio 1557
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On Sat, 3 Apr 2010, Bartosz Fabianowski wrote:
 > I have tried spoofing Windows Vista - no joy, nothing changes.
 > 
 > Overriding the _OS variable had no effect as the DSDT actually checks _OSI. I
 > applied the patch in kern/121504 and overrode _OSI with "Windows 2006".
 > Unfortunately, this had no effect on thermal settings at all.
 > 
 > Any other ideas for what to try?

No, apart from maybe overriding _CRT and/or _PSV, perhaps swapping them?  
You called changing these a hack, but a hack's fine if it works :)

My Thinkpad T23 has 90C _PSV, 96C _CRT, but I've yet to see it hit 90C; 
the last buildworld got it to about 86C, and that was in our summer.

Perhaps see if you can get it to start passive cooling at say 80C, with 
_CRT set at maybe 90C, to see whether passive cooling handles the load?

Apart from feeding it a can of air, hopefully someone else has an idea?

cheers, Ian