[Bug 81150] New: [SNB]Piglit spec_arb_shading_language_packing_execution_built-in-functions_fs-packSnorm4x8 fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81150

          Priority: medium
            Bug ID: 81150
          Assignee: idr at freedesktop.org
           Summary: [SNB]Piglit
                    spec_arb_shading_language_packing_execution_built-in-f
                    unctions_fs-packSnorm4x8 fails
        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

System Environment:
--------------------------
Platform: Sandybridge
Libdrm:       
(master)libdrm-2.4.54-17-ge8c3c1358ecaf4e90f7d43762357ae6f8e2022b6
Mesa:        (master)50bbe49c330095ba451d0f48c56759d148a609c2
Xserver:   
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel:(master)2.99.912-227-g8587b2fff218537c6ff568ac3ef561f0d39f03ff
Libva:        (master)c61d8c6ce9ffc27320e9e177c1e1123d5f1b5014
Libva_intel_driver:(master)c5cb17ea86f0065a939d3636dd26651c93d497c8
Kernel: drm-intel-nightly/ed4d04defe2c6962efe8f4ba3587a8e69e06d2dd

Bug detailed description:
------------------------- 
It fails on Sandybridge(i386) with mesa master and 10.2 branch. It works well
on x86_64 machine.
It was pass in earlier our nightly testing, fails now. But I can't reproduce
the pass.
Following cases also fail:
spec_arb_shading_language_packing_execution_built-in-functions_fs-unpackSnorm4x8
spec_arb_shading_language_packing_execution_built-in-functions_fs-unpackUnorm4x8
spec_arb_shading_language_packing_execution_built-in-functions_vs-packSnorm4x8
spec_arb_shading_language_packing_execution_built-in-functions_vs-unpackSnorm4x8
spec_arb_shading_language_packing_execution_built-in-functions_vs-unpackUnorm4x8

output:
Probe color at (0,0)
  Expected: 0.000000 1.000000 0.000000 1.000000
  Observed: 1.000000 0.000000 0.000000 1.000000
PIGLIT: {'result': 'fail' }


Reproduce steps:
-------------------------
1. bin/shader_runner
generated_tests/spec/arb_shading_language_packing/execution/built-in-functions/fs-packSnorm4x8.shader_test
-auto

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