[Bug 76816] New: [IVB/HSW/BYT bisected]Character render error when runing Steam-Half-Life2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76816

          Priority: medium
            Bug ID: 76816
          Assignee: idr at freedesktop.org
           Summary: [IVB/HSW/BYT bisected]Character render error when
                    runing Steam-Half-Life2
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: git
         Component: Drivers/DRI/i965
           Product: Mesa

Platform: IVB/HSW/BYT
Libdrm:(master)libdrm-2.4.52-10-g1cb5fc706cf5913d9dee33c939f65a23ecea17a5
Mesa:(master)7683fce8781ef0169333c5ee1276392d058cfaa8
Xserver:(master)xorg-server-1.15.99.901-129-gbf087659f0fb747c471e26c5b287c35877818040
Xf86_video_intel:(master)2.99.911-3-g220accd828c5a0054ae9e3b491a434f7a6c750e0
Cairo:(master)bb17403622e9ea474017e0039af8ee48b2b285db
Libva:(staging)bf2e1773d4373619232c4c653b8cda19ea329441
Libva_intel_driver:(staging)b1319c7f7cb9d20179b20dac2308330bd0e51ffe
Kernel:(drm-intel-nightly)git-842955

Bug detailed description:
----------------------------------------------
Character Render error when runing Steam-half Life2 on IVB/HSW/BYT. The problem
exists on gnome-session and Raw X.  It’s Mesa regression. Please see
steam-hl2.png.
By bisected show the first bad commit is :
commit 9cd51bb0c4608258199c69bc7738e72f055799d2
Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Mar 11 13:16:37 2014 -0700
    i965/vec4: Eliminate writes that are never read.

Reproduce steps:
---------------------------------------------
1, xinit
2, export
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/lib64:/lib32:/lib/:/root/.steam/ubuntu12_32:/root/.steam/ubuntu12_32/steam-runtime/i386/lib:/root/.steam/ubuntu12_32/steam-runtime/i386/lib/i386-linux-gnu:/root/.steam/ubuntu12_32/steam-runtime/i386/usr/lib:/root/.steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu:/root/.steam/ubuntu12_32/steam-runtime/amd64/lib:/root/.steam/ubuntu12_32/steam-runtime/amd64/lib/x86_64-linux-gnu:/root/.steam/ubuntu12_32/steam-runtime/amd64/usr/lib:/root/.steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu:/root/.steam/ubuntu12_64:bin
3, vblank_mode=0 ./hl2.sh -game hl2 +cl_showfps 1 -novid +timedemo hl2
+demo_quitafterplayback 1 -full -w 1920 -h 1080

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