[Bug 84082] New: [IVB/HSW/BYT-M Bisected]Show Black screen during running OglMultithread

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84082

          Priority: medium
            Bug ID: 84082
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB/HSW/BYT-M Bisected]Show Black screen during
                    running OglMultithread
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lilix.cheng at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Environment:
-----------------------------------
Platform:IVB/HSW
Libdrm:(master)libdrm-2.4.56-26-gae8edc7544e566084f7b958eb93c9109b471ca30
Mesa:(master)71d4fc88d6b97d6b9a8f1a324d2dcd0c56b79f3d
Xserver:(master)xorg-server-1.16.0-317-geaee6572beefca240c42791f9a3a6e547bedd410
Xf86_video_intel:(master)2.99.916-47-g2a4855a633f42d90e11f5c51342c514c2dc24307
Cairo:(master)e0c0a673ee757615bd3d22f46767535e9f53d6f5
Libva:(master)e0d25ece01e7aba819c910e98c4fb4706cdab055
Libva_intel_driver:(master)bc2e06ef0f89b264fe968fbff4f06e425385c3d8
Kernel:(drm-intel-nightly)3e5e5913a80f593aa8f67784220eac2658034c6c

Bug detailed description:
---------------------------------------------
Show Black screen during running OglMultithread on IVB/HSW,this issue doesn't
exist on BDW/BYT-M.
this problem exist both on gnome-session and Raw X.
It's kernel regression(drm-intel-next-queued),show bisect result first bad
commit is:
commit 1ed26b0b84dab119de93723ad646229db748842d  
Author:     Michel Thierry <michel.thierry at intel.com>
AuthorDate: Fri Sep 5 14:13:16 2014 +0100
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Mon Sep 8 09:42:19 2014 +0200

    drm/i915: Enable full PPGTT on gen7

BTW,this issue also exist on drm-intel-nightly branch.

Reproduce steps:
---------------------------------------------
1.    xinit&
2.    ./synmark2 OglMultithread

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