[Bug 93924] New: [APL] No log showing DC6 state

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93924

            Bug ID: 93924
           Summary: [APL] No log showing DC6 state
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: christophe.prigent at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121387
  --> https://bugs.freedesktop.org/attachment.cgi?id=121387&action=edit
dmesg_dc-status

Setup:
======
Platform: Broxton P A0 Platform
CPU Name : Intel(R) @ 1.2 GHz (family: 6, model: 92, stepping: 8) – 4 cores
SoC : BROXTON-P A0
CRB :  Apollo Lake RVPC1 Fab1 
Reworks : R14, R06C and R16

Software:
=========
BIOS (IFWI Version): APLK_IFWI_X64_R_2015_41_5_02 
KSC : 1.02
Linux distribution: Ubuntu 15.10 64 bits
Kernel: drm-intel-nightly 4.4.0 8114b00 from
http://cgit.freedesktop.org/drm-intel/
drm: tag libdrm-2.4.66 e342c0f from http://cgit.freedesktop.org/mesa/drm/
mesa: tag mesa-11.0.8 261daab from http://cgit.freedesktop.org/mesa/mesa/
cairo: tag 1.15.2 db8a7f1 from http://cgit.freedesktop.org/cairo
waffle: master bb29b2a from https://github.com/waffle-gl/waffle
xorg-server-macros: master d7acec2 from
git://git.freedesktop.org/git/xorg/util/macros
libva: tag libva-1.6.1 cb418f6 from http://cgit.freedesktop.org/libva/
vaapi-intel-driver: tag 1.6.1 2110b3a from
http://cgit.freedesktop.org/vaapi/intel-driver

Steps:
------
1. Boot in text mode
2. Let the system idle
3. Execute command: dmesg |grep DC

Actual result:
---------------
3. Command returns:
[    0.785079] [drm:intel_power_well_enable] enabling DC off
[    0.785080] [drm:gen9_set_dc_state] Setting DC state from 00 to 00
[    0.785083] [drm:gen9_set_dc_state] Setting DC state from 00 to 00

Expected result:
----------------
3 Log shows DC6 status: 
[enable_dc6] Enabling DC6

Info:
-----
I was able to see DC9 status

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