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Comment by mjg59 | Hacker News Reader

It's an issue with Skylake to the extent that Intel do their own hardware enablement for Linux and just haven't done everything they need to in this case. C8-SKL refers to the C state that an individual core is in - the package C states are listed further to the left in the "Package" column.

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I think the package column is also showing C8, although I'm not familiar with the layout. Here's an example of what I currently see:

            Package   |            CPU 0
  Powered On  0.0%    | POLL        0.0%    0.0 ms
  C1E-SKL     1.3%    | C1E-SKL     0.2%    7.1 ms
                      |
  C3-SKL      0.0%    | C3-SKL      0.0%    0.2 ms
  RC6pp       0.0%    | C6-SKL      0.0%    0.0 ms
  C7s-SKL     0.0%    | C7s-SKL     0.0%    0.0 ms
  C8-SKL     64.5%    | C8-SKL     99.6%    9.5 ms
                      |            CPU 1
                      | POLL        0.0%    0.0 ms
                      | C1E-SKL     0.0%    0.0 ms
                      |
                      | C3-SKL      0.0%    0.0 ms
                      | C6-SKL      0.0%    0.6 ms
                      | C7s-SKL     0.0%    0.0 ms
                      | C8-SKL    100.0%   84.8 ms
                      | ...

What would I see if it were properly using C8?

Hm. Which version of Powertop is this? Your output is corrupt - RC6pp is a GPU power state, the package states should all be "PC". The output I have looks like https://gist.github.com/mjg59/c753a7cb868fbbfa83e6060c4e4d0f...

Oh, are you on a desktop part? The issue is related to the mobile ones. I've updated the post to make that explicit.

Yes, this is a desktop i7-6700. Sorry if that confused things. Yes, the addition to the top of the post is much clearer. Thanks!

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