W520 Turbo Boost works only after entering Setup (BIOS 1.34)

Hi there,
similar issue but not quite fitting the thread about Intel TB missing in Battery mode, I can reproduce the following BIOS/Windows bug:
- boot the system without entering BIOS straight to Windows 7 : Intel Turbo Boost not working (i.e. frequency dynamically changes between 800 and 2500 Ghz)
- boot the system, enter setup, press F10 and save settings (without changing anything), boot Windows: Turbo Boost works
Is this a BIOS or a Windows problem? It is a workaround to get Turbo-Boost always, but quite inconvenient.
Can someone with similar Turbo Boost problems perhaps check if this is a general issue and could be fixed by Lenovo in a new BIOS update?
System: W520 i7-2860QM @2500 MHz, BIOS 1.34 (same problem on BIOS 1.26).

Hi again,
after spending an afternoon with an IBM service technician we isolated the problem. To make sure we switched boards and tested 4 bios version: 1.26, 1.32. 1.34 and 1.35.
Problem can be reproduced and monitored with Intel Turbo Boost Monitor tool and/or CPU-Z.
Turning
BIOS CPU setting: hyperthreading - off
causes undefined behavior of the turbo boost settings. It works for some reboots. It seems to cause problems more often when the NVidia card is running (either through setting GPU to discrete or by using DisplayPort). Sometimes when taking out AC adapter and plugin back in it won't.All in all very random behavior, but 1 in 4 trials it won't work. Also, when the notebook was off for some time, turbo-boost never works on first boot (need to enter setup at least once, then it will work for some time and reboots).
Symptoms:
Whenever Turbo-Boost is not working, CPU goes only to 2.5 Ghz at max.regardless of energy plan settings.
Switching Hyperthreading back on has (so far) solved the isse (both on AC and battery-without-GPU mode), tested successfully with BIOS 1.32, 1.34 and 1.35. Now we have turbo boost but slightly slower single-core simulationn performance. Not nice, but at least there is a workaround.
Workaround so far (until Lenovo has fixed the BIOS): leave Hyperthreading turned on.
(PS: The service issue was marked as "not solved" and will be send a level higher in Lenovo Support - let's see how this will be taken care of).

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