Thermal Control Panel with newer Latitude, Precision

I have an E6540 that drives me nuts because the loud fan is basically always on, it turns on as soon as the CPU reaches 41C (105F).
Previously it was possible to tweak such things by using the hidden Thermal Control Panel (Fn+Shift held down followed by pressing 15324 in that order then Fn+r).
The very bad news is that this doesn't seem to work anymore on my E6540 nor does it work on a M4800 I also tried. At least Fn+r doesn't start the TCP.

Can someone please help me out here? How can one get in this hidden Thermal Control Panel with the newer Latitude or Precision?

Many thanks!

 

As an alternative, have you checked if you can change the cooling policy to passive in power options?

 

As usual, the answer is probably "there is no way to get to the thermal control panel, and there is no way to do manual fan control". I haven't tried doing the "active" to "passive" cooling switch on a newer Latitude/Precision, but I've never had that function do anything on any Latitude/Precision, so I'm doubtful that it'll do anything here.

 

It is already on passive and the performance profile is on the lowest. It doesn't help at all, the fan kicks in at this very low temperature.
By the looks of it, DELL wants the fan spinning all the time, what a pity (to spare the harsher words).

The first who finds a way to control the fan on this machine (that I actually hate, I am forced to use it because of the politics at the company I work) from within Windows 7 Pro x64 will be rewarded 50 Euros or the same amount in $... just post the solution here and PM me.

 

It doesn't work anymore since dell m6500 ,however I remember it working partially fn+w or fn+q or fn+z or fn+e would change fan speed but not stop throttling as previous models. (I have Dell M6600).
Do the procedure as you mentioned and then hit the keys I mentioned, it worked for me and allowed me to change the fan speed,notice that the menu doesn't appear ,but you clearly can hear the fan speed changing .
Do you use Dell's performance manager ? it adds profiles to windows power settings, the fan behaves differently on some profiles.

 

fn+z seems to do something, but it is the only one.
The fan stops for about five seconds, then it starts again at the previous speed.

All other shortcuts do not seem to do anything at all, they do not influence the speed of the fan at all.

fn+z also seems to be working without entering this 15324 mode...

 

Haven't heard anything that work, hwinfo has a very slim chance that "may" kind of work.

I find passive and aggressive don't really matter at all~~