My X61 Thinkpad (Ubuntu 8.10) shuts down after 30 to 60 minutes of
watching a Flash-intensive web site (e.g. episodes on thedailyshow.com).
In /var/log/messages I see:

Apr  5 11:34:23 x61 kernel: [101330.895345] ACPI: Critical trip point

$ uname -a 
Linux x61 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686 GNU/Linux

I found that the fan never goes above 3000rpm. Doing

rmmod thinkpad_acpi && modprobe thinkpad_acpi fan_control=1
echo "level 7" > /proc/acpi/ibm/fan

got the fan up to 3900rpm and kept the CPU temperature around 65 to 70C.
So there's a problem with the CPU fan control in a stock Ubuntu 8.10
install.

** Attachment added: "lspci.txt"
   http://launchpadlibrarian.net/24833993/lspci.txt

-- 
acpi fan control does not work, laptop overheats
https://bugs.launchpad.net/bugs/258454
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