[Bug 80991] New: [BDW]Piglit spec_ARB_sample_shading_builtin-gl-sample-mask_2 fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80991

          Priority: medium
            Bug ID: 80991
          Assignee: idr at freedesktop.org
           Summary: [BDW]Piglit
                    spec_ARB_sample_shading_builtin-gl-sample-mask_2 fails
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: huax.lu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

System Environment:
--------------------------
Platform: Broadwell E2
Libdrm:       
(master)libdrm-2.4.54-17-ge8c3c1358ecaf4e90f7d43762357ae6f8e2022b6
Mesa:        (master)370184e813b25b463ad3dc9ca814231c98b95864
Xserver:(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel:(master)2.99.912-210-g24c9bac7eb6e17b55044d719bab74d16fd68c450
Libva:        (master)c61d8c6ce9ffc27320e9e177c1e1123d5f1b5014
Libva_intel_driver:(master)c5cb17ea86f0065a939d3636dd26651c93d497c8
Kernel:    (drm-intel-nightly) 026bdf385dec2e1ade18eab75d0eed3997b88e9c

Bug detailed description:
-----------------------------
Following cases fail on Broadwell(Host bridge: Intel Corporation Device 1604
(rev 08)) with mesa master branch and 10.2 branch.
They work well on 0x1604(rev07).
spec_ARB_sample_shading_builtin-gl-sample-id_2
spec_ARB_sample_shading_builtin-gl-sample-mask-simple_4
spec_ARB_sample_shading_builtin-gl-sample-mask-simple_6
spec_ARB_sample_shading_builtin-gl-sample-mask-simple_8
spec_ARB_sample_shading_builtin-gl-sample-mask_2
spec_ARB_sample_shading_builtin-gl-sample-mask_4
spec_ARB_sample_shading_builtin-gl-sample-mask_6
spec_ARB_sample_shading_builtin-gl-sample-mask_8
spec_ARB_sample_shading_builtin-gl-sample-position_2

run  bin/arb_sample_shading-builtin-gl-sample-mask 2 -auto
output:
Probe color at (2,0)
  Expected: 0.000000 1.000000 0.000000 1.000000
  Observed: 1.000000 0.000000 0.000000 1.000000
FBO attachment = TEXTURE, result = fail
Probe color at (2,0)
  Expected: 0.000000 1.000000 0.000000 1.000000
  Observed: 1.000000 0.000000 0.000000 1.000000
FBO attachment = RENDERBUFFER, result = fail
PIGLIT: {'result': 'fail' }

Reproduce steps:
---------------------------- 
1. xinit
2. bin/arb_sample_shading-builtin-gl-sample-mask 2 -auto

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