I've got a XPS 9350 laptop, and ever since Dell released the updated Intel Dynamic Platform and Thermal Framework release 8.2.10900.330, I have been unable to configure the TDP settings in power. Previously, I was able to select Low TDP on battery, and High TDP on power. However, now all it offers is a single option: 15.0W@3.2 Ghz. Please see screenshot.
I've tried reverting to the previous version of the Intel framework, but it is still broken. I've even tried complete clean installs after nuking the partition.