[Bug 90514] New: [BSW]disable RC6 make some OpenCL test cases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90514

            Bug ID: 90514
           Summary: [BSW]disable RC6 make some OpenCL test cases fail
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mengmeng.meng at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==Regression==
--------------------------
Regression: No. Firstly tests OpenCL on BSW.
Ubuntu: 14.04

==kernel==
--------------------------
drm-intel-next-queued: git-65de79

==Test cases==
Beignet: git://anongit.freedesktop.org/git/beignet (master git-6aae2e8)
failed cases: compiler_async_copy_char2
              compiler_async_copy_uchar2

==Bug detailed description==
-----------------------------
Disable RC6 in kernel makes some OpenCL test cases fail. If enable RC6(no
i915.enable_rc6=0 in grub), the case works OK.


e.g. run compiler_async_copy_char2() 
compiler_async_copy_char2()    [FAILED]
    Error: dst[i] == src[i]
  at file /home/OpenCL/beignet/utests/compiler_async_copy.cpp, function
compiler_async_copy_char2, line 46


==Reproduce steps==
---------------------------- 
1. set "i915.enable_rc6=0"
2. utests/utest_run -c compiler_async_copy_char2

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