[Bug 88622] New: [BSW] Unable to enter S3/S4

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88622

            Bug ID: 88622
           Summary: [BSW] Unable to enter S3/S4
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jeff.zheng at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112534
  --> https://bugs.freedesktop.org/attachment.cgi?id=112534&action=edit
dmesg when unable suspend on C step

==System Environment==
--------------------------
BIOS version V53
CPU: C0 step
Regression: No. I tried with the same commit on DUT with B step CPU and does
not see this issue. 

Non-working platforms: BSW with C0 CPU

==kernel==
--------------------------
-testing: 2015_01_18 commit 6dd5bb25ce0ed3a0012b69d553d74e1a0d39c313(test
fails)


==Bug detailed description==
-----------------------------
Unable to enter S3/S4 on BSW with C0 cpu. When I tried:
echo mem > /sys/power/state
Or
echo disk > /sys/power/state

It looks like the system suspend but finally system automatically resumes.

On BSW with B step cpu, system will suspend, and system will resume only when I
press the power button.

The reproducibility > 90%

==Reproduce steps==
---------------------------- 
1. Boot BSW, login run:
echo mem > /sys/power/state

Or

echo disk > /sys/power/state

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