[Bug 72140] New: [ILK/IVB Mesa10.0]Webglc This browser does not appear to support WebGL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72140

          Priority: high
            Bug ID: 72140
          Assignee: idr at freedesktop.org
           Summary: [ILK/IVB Mesa10.0]Webglc This browser does not appear
                    to support WebGL
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

Created attachment 89972
  --> https://bugs.freedesktop.org/attachment.cgi?id=89972&action=edit
webglc

Environment:
--------------------
Platform:  Ironlake/Ivybridge 
Libdrm:    (master)libdrm-2.4.49-2-gc3d96897de647bd5f6d4802c108a3f65a307d61b
Mesa:    (10.0)5ec641bbc9447da314cca2685efe9876c7bc63e3
Xserver:(server-1.14-branch)xorg-server-1.14.4.901
Xf86_video_intel:(master)2.99.906-54-gd65b57cd332ca4435867afa31b6da85481635d52
Cairo:    (master)31eff5c6eb57ad379689748fd8c60a5ffe0ba481
Libva:    (master)73a11b3e249da35ede92560eb089239252721351
Libva_intel_driver:(master)4a0f76c5b706fccbc85fadaeee9d785cd7b57d5a
Kernel:    (drm-intel-fixes) cd66407810869709e0d6764409137d48c6812cfc

Bug detailed description:
-----------------------------
When run webglc, reports "This  browser does not appear to support WebGL".
It happens on Ironlake and Ivybridge with mesa 10.0 branch. It works well on
mesa master and 9.2 branch.
It doesn't happen on pineview, sandybridge and haswell.

Run Chrome Verison: 27.0.1453.73 and 31.0.1650.57.

Reproduce steps:
----------------
1. go to
https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/webgl-conformance-tests.html
run webglc case.

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