[Bug 80078] New: [BDW]GFX device consume the same Watt as Idle when it's active

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80078

          Priority: medium
            Bug ID: 80078
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]GFX device consume the same Watt as Idle when
                    it's active
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lei.a.liu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 101142
  --> https://bugs.freedesktop.org/attachment.cgi?id=101142&action=edit
dmesg

==System Environment==
--------------------------

3.15-kernel-2014Q2-release (fail)
commit:1860e379875dfe7271c649058aeddffe5afd9d0d


==kernel==
--------------------------
-nightly: b438e8793c6d18b0998d75cdf8115a5898ed21d1 (works)
    drm-intel-nightly: 2014y-06m-13d-22h-09m-12s integration manifest
-queued: 868d665b43473e230d560d5186535270a3d57a19 (works)
    drm/i915: Fix memory leak in intel_dsi_init() error path
-fixes: 223a6f2b975ab35d93270ea1d4fb6e0ac6b27fe6 (works)
    drm/i915/bdw: remove erroneous chv specific workarounds from bdw code

==Bug detailed description==
-----------------------------
GFX device consume same Watt no matter when it's idle or active.

[root at x-bdw05 tests]# /GFX/Test/P304 frames in 5.0 seconds = 60.730 FPS
erformance/performance_pnp/301 frames in 5.0 seconds = 60.001 FPS
turbostat
301 frames in 5.0 seconds = 60.001 FPS
    Core     CPU Avg_MHz   %Busy Bzy_MHz TSC_MHz     SMI  CPU%c1  CPU%c3 
CPU%c6  CPU%c7 CoreTmp  PkgTmp Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 Pkg%pc8 Pkg%pc9
Pk%pc10 PkgWatt CorWatt GFXWatt
       -       -       7    0.43    1631    1796       0   99.57    0.00   
0.00    0.00      35      36    0.00    0.00    0.00    0.00    0.00    0.00   
0.00    2.23    0.06    0.06
       0       0      12    0.77    1559    1796       0   99.23    0.00   
0.00    0.00      35      36    0.00    0.00    0.00    0.00    0.00    0.00   
0.00    2.23    0.06    0.06
       0       2       0    0.01    1500    1796       0   99.99
       1       1      16    0.92    1694    1796       0   99.08    0.00   
0.00    0.00      34
       1       3       0    0.01    1378    1796       0   99.99

==Reproduce steps==
----------------------------
xinit &
glxgears & 
./turbostat

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