[Bug 80896] New: [BDW Regression]dmesg error "<3>[ 1.954836] [drm:gen8_irq_handler] *ERROR* The master control interrupt lied (SDE)!" after boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80896

          Priority: high
            Bug ID: 80896
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Regression]dmesg error "<3>[    1.954836]
                    [drm:gen8_irq_handler] *ERROR* The master control
                    interrupt lied (SDE)!" after boot
        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: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 102239
  --> https://bugs.freedesktop.org/attachment.cgi?id=102239&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: b6fdd0f2b990006daba19eec676b632faa523fc8

Non-working platforms: BDW

==kernel==
--------------------------
origin/drm-intel-nightly: eb638c7fabe97a9df752aeb2f59a9463ce4aed8e(fails)
    drm-intel-nightly: 2014y-07m-03d-14h-50m-16s integration manifest
origin/drm-intel-next-queued: 5e59f7175f96550ede91f58d267d2b551cb6fbba(fails)
    drm/i915: Try harder to get FBC  
origin/drm-intel-fixes: 5549d25f642a7e6cfb8744d0031a9da404f696d6(works)
    drm/i915: Drop early VLV WA to fix Voltage not getting dropped to Vmin

==Bug detailed description==
dmesg error "<3>[    1.954836] [drm:gen8_irq_handler] *ERROR* The master
control interrupt lied (SDE)!" after boot.

Output:
[root at x-bdw01 ~]# dmesg -r | egrep "<[1-3]>" |grep drm
<3>[ 1.955683] [drm:gen8_irq_handler] *ERROR* The master control interrupt lied
(SDE)!
<3>[ 1.955848] [drm:gen8_irq_handler] *ERROR* The master control interrupt lied
(SDE)!
<3>[ 3.683649] [drm:gen8_irq_handler] *ERROR* The master control interrupt lied
(SDE)!
<3>[ 3.686870] [drm:gen8_irq_handler] *ERROR* The master control interrupt lied
(SDE)!


==Reproduce steps==
---------------------------- 
1.  boot
2.  dmesg -r | egrep "<[1-3]>" |grep drm

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