It was specifically designed to handle some of the more common throttling problems. If you are not able to solve this problem with Intel XTU then I would suggest trying ThrottleStop from TechPowerUp. Different laptops use different throttling methods but the end results are the same. If you look into things you will see that Lenovo has been doing a few questionable things like this for years.
When the Nvidia GPU is active, its default behaviour is also to disable turbo boost. My Lenovo Y510P has a similar "feature" / bug. When this happens, 2.90 GHz will be your maximum speed. Do you see a familiar number? I think your CPU is being switched to TDP-up mode and the reason it is getting stuck at 2.90 GHz is because turbo boost is being disabled, either accidentally or on purpose. In TDP-up mode, the power consumption limit is raised to 25 Watts and the default frequency increases from 2.80 GHz to 2.90 GHz. More throttling, less heat and less peak power consumption. Some smaller devices switch to TDP-down mode when running on battery power. They can also enter TDP-down mode where they will be limited to 7.5 Watts. When running in default mode and they are heavily loaded, long term, they will throttle and slow down so they do not exceed 15 Watts. By default, they have a base frequency of 2.80 GHz and a TDP rating of 15 Watts. The TDP rating can be reconfigured on the fly by software. These CPUs are sort of like 3 different CPUs in one package. The 7600U is part of Intel's low power U series.
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