[Bug 78374] New: [HSW Regression]igt/kms_setmode/clone-exclusive-crtc causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78374

          Priority: high
            Bug ID: 78374
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW Regression]igt/kms_setmode/clone-exclusive-crtc
                    causes system hang
        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

*System Environment:
--------------------------
Regression: Yes.  
This case was failed before (Bug 68463)

Non-working platforms: HSW

 *kernel: 
--------------------------
-nightly: 30c8c9cd8bc88d6ae70f09d403e725b51e0bd7dd (fails)
-queued: bf67a6fd5ef8ef7f6a8548bc9a6441b290bf2752 (fails)
    Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Date:   Fri May 2 11:35:51 2014 +0300

    drm/i915/chv: Add DPINVGTT registers defines for Cherryview

    Due to Pipe C DPINVGTT has more bits on CHV.

    v2: Fix comment to say VLV/CHV (Rafael)

    Reviewed-by: Rafael Barbalho <rafael.barbalho at intel.com>
    Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

-fixes: 0aa7de323a32ca0b27769901b9607fc892b90dbc (fails)
    Author: Jani Nikula <jani.nikula at intel.com>
    Date:   Tue May 6 14:56:52 2014 +0300

    drm/i915: use lane count and link rate from VBT as minimums for eDP

    Most likely the minimums for both should be enough for enabling the
    native resolution on the eDP, and we'll end up using the predetermined
    optimal link config for the panel.

    v2: Add debug prints.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=73539
    Tested-by: Markus Blank-Burian <burian at muenster.de>
    Reviewed-by: Damien Lespiau <damien.lespiau at intel.com>
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

 *Bug detailed description:
-----------------------------
igt/kms_setmode/clone-exclusive-crtc causes system hang

unable to get dmesg due to the system was hang and the machine haven't serial
port.

Output:
  ./kms_setmode --run-subtest clone-exclusive-crtc
IGT-Version: 1.6-g4bd9fe6 (x86_64) (Linux:
3.14.0-rc7_drm-intel-next-queued_1bf70d_20140328+ x86_64)
Testing: clone-exclusive-crtc 2 connector combinations
  Test id#1 CRTC count 2
    CRTC[3] [Pipe A] Mode: 1920x1080 at 60Hz Connectors: eDP-1[10]
    CRTC[5] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[18] (NC)


 *Reproduce steps:
---------------------------- 
1. ./kms_setmode --run-subtest clone-exclusive-crtc

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