[Bug 75746] New: [IVB/HSW bisected]WebGL benchmark render error

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Mar 4 01:24:31 PST 2014


https://bugs.freedesktop.org/show_bug.cgi?id=75746

          Priority: medium
            Bug ID: 75746
          Assignee: idr at freedesktop.org
           Summary: [IVB/HSW bisected]WebGL benchmark render error
        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
Libdrm: (master)libdrm-2.4.52-2-gcbb31f2d6e674513c0f66484c414475baba09153
Mesa:(master)e5e4120723f7aa927faadca96910d4e8cbd99f40
Xserver:(master)xorg-server-1.15.0-558-gc1ce807d9f18f215332d7eeb8
Xf86_video_intel:(master)2.99.907-54-g294180b3bf78f2c0ae2f1197e1c
Cairo:(master)2a7f133639bed86a29dd9693cb78c0aa42eaff30
Libva:(staging)79ddde6bab54618046f136471c020c08ff4fde50
Libva_intel_driver:(staging)6736a39fce442a8e5abb2a2e99adf56e3965d35f
Kernel: drm-intel-nightly git-0dfe3c


Bug detailed description:
-----------------------------------------------------------------------------
WebGL benchmark render error on IVB/HSW, The problem exists on both
gnome-session and Raw X.
Please see Xorg.o.log and webgl.png.
It’s Mesa regression, bisecting show that the first bad commit is
4bd6e0d7c69b304be88996a6c2b96ce7d996e627 
Author: Matt Turner <mattst88 at gmail.com> 
Date: Sat Dec 21 11:28:05 2013 -0800 
    glsl: Vectorize multiple scalar assignments 
    Reduces vertex shader instruction counts in DOTA2 by 6.42%, L4D2 by 
    4.61%, and CS:GO by 5.71%. 
    total instructions in shared programs: 1500153 -> 1498191 (-0.13%) 
    instructions in affected programs: 59919 -> 57957 (-3.27%) 
    Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

Reproduce steps:
-----------------------------------------------------------------------------
1. xinit&
2. google-chrome-stable --enable-webgl --ignore-gpu-blacklist --user-data-dir
http://tinderbox.sh.intel.com/webglsamples.googlecode.com/hg/dynamic-cubemap/dynamic-cubemap.html

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