[Bug 91203] New: [SKLY Regression] System hangs while resume-from-memory but works with "modprobe.blacklist=i915 nomodeset " cmdline

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91203

            Bug ID: 91203
           Summary: [SKLY Regression] System hangs while
                    resume-from-memory but works with
                    "modprobe.blacklist=i915 nomodeset " cmdline
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: bin.a.xu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==
--------------------------
Regression: Yes. Good commit: 186047de2f57b1ed4d1bd52f824b88b25275d378. 
Bisect in progressing
Non-working platform: SKLY

==kernel==
nightly: d762ba10e78661f3d1aa97e4063ffe7650fc5b6d (fails)
drm-intel-nightly: 2015y-07m-02d-20h-25m-48s UTC integration manifest

==Bug detailed description==
-----------------------------
With the latest drm-intel-nightly kernel, system hangs while
resume-from-memory,
but with "modprobe.blacklist=i915 nomodeset" cmdline in the kernel command
line, the suspend/resume works.

==Reproduce steps==
1.Boot the system
2.echo mem > /sys/power/state
3 Resume by pressing power button

But run the test again with  "modprobe.blacklist=i915 nomodeset" in the kernel
command cmdline, the system resume normally.

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