[Bug 76543] New: [BYT] System fail to enter package c6 using 2014Q1 release package

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76543

          Priority: medium
            Bug ID: 76543
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT] System fail to enter package c6 using 2014Q1
                    release package
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: wendy.wang at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Load the 2014Q1 release package kernel and other GFX components drivers:
Kernel_version:      3.13.6
Libdrm:                 (master)libdrm-2.4.52
Mesa:                   (10.1) mesa-10.1
Xserver:                    (server-1.15-branch)xorg-server-1.15.0
Xf86_video_intel:     (master)2.99.910
Cairo:                  (master)1.12.6
Libva:                  1.3.0.pre1
Libva_intel_driver:   1.3.0.pre1
Intel-gpu-tools:     1.6

1. Set the disk link power management policies to min_power.
For each host${i} directory inside /sys/class/scsi_host/, echo min_power >
host${i}/link_power_management_policy
2. Run ./turbostat tool to wait for the PC6 results, but we did not see any PC6
residency always show 0
cor CPU    %c0  GHz  TSC SMI    %c1    %c3    %c6 CTMP   %pc3   %pc6
          0.22 0.65 2.00   0   0.48   0.00  99.30   32   0.00   0.00
  0   0   0.30 0.65 2.00   0   0.37   0.00  99.33   32   0.00   0.00
  1   1   0.14 0.67 2.00   0   0.60   0.00  99.27   32
cor CPU    %c0  GHz  TSC SMI    %c1    %c3    %c6 CTMP   %pc3   %pc6
          0.21 0.72 2.00   0   4.27   0.00  95.51   32   0.00   0.00
  0   0   0.30 0.74 2.00   0   0.26   0.00  99.44   32   0.00   0.00
  1   1   0.12 0.68 2.00   0   8.28   0.00  91.59   32
cor CPU    %c0  GHz  TSC SMI    %c1    %c3    %c6 CTMP   %pc3   %pc6
          0.31 0.85 2.00   0   0.31   0.00  99.38   32   0.00   0.00
  0   0   0.49 0.89 2.00   0   0.36   0.00  99.16   32   0.00   0.00
  1   1   0.13 0.69 2.00   0   0.27   0.00  99.60   32
cor CPU    %c0  GHz  TSC SMI    %c1    %c3    %c6 CTMP   %pc3   %pc6
          0.21 0.68 2.00   0   0.35   0.00  99.44   32   0.00   0.00
  0   0   0.30 0.68 2.00   0   0.28   0.00  99.42   32   0.00   0.00
  1   1   0.13 0.67 2.00   0   0.42   0.00  99.46   32

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