I upgraded to karmic (kernel 2.6.31-2-generic) and did the `stress --cpu
16 --vm 2 --vm-bytes 128M` test

Before the test:

sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:       +86.0°C  (crit = +98.0°C)                  
temp2:       +89.0°C  (crit = +120.0°C)                  

k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:  +87.0°C                                    
Core1 Temp:  +87.0°C                  

After 15 min:

sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:       +92.0°C  (crit = +98.0°C)                  
temp2:       +85.0°C  (crit = +120.0°C)                  

k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:  +81.0°C                                    
Core1 Temp:  +82.0°C 

Right after killing the stress test:

sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:       +78.0°C  (crit = +98.0°C)                  
temp2:       +81.0°C  (crit = +120.0°C)                  

k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp:  +76.0°C                                    
Core1 Temp:  +81.0°C

I am not experiencing shutdowns caused by overheating.
In Jaunty, (Kernel 2.6.28-11-generic) the stress test didn't even last 2 min 
before shutting itself down.

-- 
Ubuntu 9.04 laptop overheat and shutdown
https://bugs.launchpad.net/bugs/370173
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