[Bug 84524] New: Please don't export RC6p or RC6pp if they don't exist

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84524

          Priority: medium
            Bug ID: 84524
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Please don't export RC6p or RC6pp if they don't exist
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: josh at freedesktop.org
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Currently, powertop displays RC6p and RC6pp on all platforms, even though
current hardware just has one unified RC6 state.  This generates support
questions ("why isn't my system getting into a deeper sleep state?").

The kernel driver should not export rc6p_residency_ms or rc6pp_residency_ms at
all on hardware platforms that don't have those distinct states.  We can then
teach powertop to only display the states for which _residency_ms files exist. 
(I've confirmed that existing versions of powertop will simply display 0
residency if the files don't exist, as though they existed and contained 0.)

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