I couldn't get my computer to boot with the release candidate kernel.
3.1.0-0301rc9-generic_3.1.0-0301rc9.201110050905_amd64

Using the latest Daily build 
3.1.0-999-generic_3.1.0-999.201110040905_amd64

I could boot in recovery mode (failsafe graphics). There I have the same
amount of information in /proc/acpi as mentioned before, ie no thermal
or fan-related stuff.

Still in the daily build:
I used photoshop (under wine) to do some filtering on a large image. This takes 
one of the threads to 100% capacity for a while. The fans speed up but after 10 
minutes 
sensors return the following:

sensors
coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +95.0°C  (high = +84.0°C, crit = +100.0°C)  
Core 1:      +86.0°C  (high = +84.0°C, crit = +100.0°C)  
Core 2:      +87.0°C  (high = +84.0°C, crit = +100.0°C)  
Core 3:      +86.0°C  (high = +84.0°C, crit = +100.0°C)  

Now, since I have no way of actually checking the fan speed (suggestions
anyone?) I can't say if they are at maximum or not. It may also be a
hardware issue (loosely attached heat sinks, not enough thermal
paste....dust?). I feel a little uncomfortable grabbing your attention
like this, with inconclusive information, but let me know if there is
anything else I can do.

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https://bugs.launchpad.net/bugs/874355

Title:
  Dell studio 1747 overheating, fans spin slow even above high temp.

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