CPU frequency still stuck at lowest frequency with intel_pstate on 4.9

Hello, Running kernel 4.9.2-2 and I am still stuck at 800MHz if I use the intel_pstate driver on a Dell XPS 15 (9550) with the latest BIOS (1/23/2017). How can I contribute to a diagnosis & fix of this? intel_pstate is pretty important for Sandy Bridge CPUs and above. I filed Bug#850053 with 4.8

Bug#850053: linux-image-4.8.0-2-amd64: CPU Frequency stuck at 800MHz with Intel_pstate governor

Package: src:linux Version: 4.8.11-1 Severity: important Hello, First off, I'll mention that it's quite possible that this was fixed upstream and has made its way to 4.9 based on this thread: https://bugzilla.kernel.org/show_bug.cgi?id=90041 However, filing this for reference: in 4.8, the CPU fr