[Bug 78056] New: [HSW] resume from s4 sporadically causes system hang,with warm boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78056

          Priority: medium
            Bug ID: 78056
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW] resume from s4 sporadically causes system
                    hang,with warm  boot
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: All
          Reporter: lei.a.liu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Environment:
-------------------
Kernel: (drm-intel-next-queued)b7c0d9df97c10ec5693a838df2fd53058f8e9e96
Some additional commit info:
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Fri Apr 25 16:59:00 2014 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Fri Apr 25 16:59:00 2014 +0200

    drm/i915: Integrate cmd parser kerneldoc

    Ville noticed that we have this nice kerneldoc but it's not integrated
    anywhere. Fix this asap!

    Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Cc: Brad Volkin <bradley.d.volkin at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>


Description:
--------------------
run S4 test in a loop. system resume with hang. This issue is probabilistic,
perhaps it will come up to your eyes for just a while S4 test or more. I remove
i915 module,then I run 20 times. It works well.

Reproduce step:
----------------------
1.boot up machine with command "reboot"(warm boot)
2.echo 0 > /sys/class/rtc/rtc0/wakealarm ; 
  echo +10 > /sys/class/rtc/rtc0/wakealarm; 
3.echo disk > /sys/power/state
4.loop running step 2 and 3

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