[Bug 97002] dEQP-GLES3.functional.shaders.derivate.dfdx.fbo_float_vec2_highp fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97002

            Bug ID: 97002
           Summary: dEQP-GLES3.functional.shaders.derivate.dfdx.fbo_float_
                    vec2_highp fails
           Product: Mesa
           Version: 11.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: xinghua.cao at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

We found this issue when running WebGL 2.0 test as there is a case ported from
native dEQP. However, this also fails with native dEQP test.
Steps to repro:
1. ./deqp-gles3 -n
dEQP-GLES3.functional.shaders.derivate.dfdx.fbo_float_vec2_highp

Result:
This case fail. In fact, there are other 18 failure cases related with dfdx.

Notes:
We found these failure dfdx cases only exist on Broadwell machine. But these
cases pass on Skylake machine. And dfdy cases pass on Broadwell and SKylake
machine. 

Are there some good reason to explain it, thank you.

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