Seeing much the same with 16.04 on an Intel NUC with a Skylake i5 6260U,
and a Samsung 950 NVME, with the default kernel or 4.6-rc7. (I've been
tracking the 4.6 RC's and this behavior has been apparent in each.)
Running powertop with no tuning option shows all usage confined to C2
(pc2).
Running powertop with the autotune option ("powertop --auto-tune")
results in usage spread out among pc2, pc3, and, occasionally, pc7. PC8
and lower are never reached.
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https://bugs.launchpad.net/bugs/1579917
Title:
Skylake processor with NVMe drive never reaches low power package
states on X1 Carbon gen 4
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