[Bug 66951] New: [Calpella]Resume from S4 causes system reboot sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66951

          Priority: medium
            Bug ID: 66951
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [Calpella]Resume from S4 causes system reboot
                    sporadically
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:
--------------------------------------------
Description :
Kernel: (drm-intel-next-queued)50b44a449ff1a19712ebc36ffccf9ac0a68033bf
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Wed Jun 5 13:34:33 2013 +0200

    drm/i915: clear DPLL reg when disabling i9xx dplls

Bug detail Description:
--------------------------------------------
System can suspend to disk successfully, but will reboot while resuming from S4
sporadically. This happens about 1 in 5 times. 

Reproduce step:
--------------------------------------------
1. booting up machine
2. echo disk > /sys/power/state --> system reboot

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