[Bug 72779] New: [HSW mobile GT3e]System will hangs after executed "echo mem > /sys/power/state" on x86_64 OS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72779

          Priority: medium
            Bug ID: 72779
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW mobile GT3e]System will hangs after executed
                    "echo mem > /sys/power/state" on x86_64 OS
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

system Environment:
--------------------------
platform: haswell 
CPU:  Intel(R) Core(TM) i7-4950HQ CPU @ 2.40GHz
Libdrm:    (master)libdrm-2.4.50
Mesa:    (master)7435d9f77c84a57ad9bbed2e6558c0f06cac5cd6
Xf86_video_intel:(master)2.99.906-79-gbd22abee8f33b20ff6bc7297b0a9ae8708d18727
Cairo:    (master)8e11a42e3e9b679dce97ac45cd8b47322536a253
Libva:    (staging)1264cd81fd8728f18bd2feedf6e9c1a232663890
Libva_intel_driver:(staging)2a61b0d17072bdc5b58608e3dfa2c4f9f80dcec4
Kernel:    (drm-intel-nightly) 2a9f2367690435ba1d3132c92a71300d2dbe90ba

Bug detailed description:
-------------------------
On haswell mobile GT3e(with 64bit kernel), System will hangs after executed
"echo mem > /sys/power/state". It works well with 32bit kernel. 

Unable to got dmesg because the system will hangs after executed "echo mem >
/sys/power/state"

This bug unable to reproduce on other HSW(CPU: Intel(R) Core(TM) i7-4700MQ CPU
@ 2.40GHz or Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz)

Reproduce steps:
--------------------
1. echo mem > /sys/power/state

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