[Bug 69920] New: [IVB mobile bisected] Direct rendering is not supported when VGA arb is necessary for the device

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69920

          Priority: medium
            Bug ID: 69920
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB mobile bisected] Direct rendering is not
                    supported when VGA arb is necessary for the device
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mengmeng.meng at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 86787
  --> https://bugs.freedesktop.org/attachment.cgi?id=86787&action=edit
Xorg.0.log

System Environment:       
----------------------------------------------
Platform: IVB mobile bisected
Libdrm:    (master)libdrm-2.4.46-42-gbf4a7cd4b2456d4dc93a86bbcc51eba4ae73390a
Mesa:    (master)b2d5757831e2b67d87d3f80caa7f4ec10fce142b
Xserver:(master)xorg-server-1.14.99.1-215-g7d3d4ae55dd6ee33843
Xf86_video_intel:(master)2.99.902-56-g8ef851b223253c38e6367efdeff6b4d551cd2b6b
Cairo:    (master)38a925460b35c82833dc4d508e7a0e7e84242318
Kernel:    (drm-intel-nightly) 92e1fa095163afb89cb79f491711e4b249ced68a

Bug detailed description:
----------------------------------------------
Direct rendering is not supported when VGA arb is necessary for the device on
IVB mobile.The problem doesn't exist on IVB desktop and other platform. Please
see Xrog.0.Log, dmesg.log attached.

It’s Kernel -dinq regression, bisecting show that the first bad commit is:
81b5c7bc8de3e6f63419139c2fc91bf81dea8a7d is the first bad commit
commit 81b5c7bc8de3e6f63419139c2fc91bf81dea8a7d
Author: Alex Williamson <alex.williamson at redhat.com>
Date:   Wed Aug 28 09:39:08 2013 -0600

    i915: Update VGA arbiter support for newer devices

Reproduce steps:
---------------------------------------------
1, xinit&
2, check Xrog.0.Log

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