[Bug 84211] New: [BSW]Ogles3conform ES3-CTS.gtf.GL3Tests.rgb8_rgba8.rgb8_rgba8_rgb fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84211

          Priority: medium
            Bug ID: 84211
          Assignee: idr at freedesktop.org
           Summary: [BSW]Ogles3conform
                    ES3-CTS.gtf.GL3Tests.rgb8_rgba8.rgb8_rgba8_rgb 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: BSW
Libdrm:       
(master)libdrm-2.4.56-29-g666788a6062de62aa0b3560760fbb0903167a319
Mesa:        (master)d69faf851fff5d41086c9940b2fcf2aa72c40e60
Xserver:(master)xorg-server-1.16.0-317-geaee6572beefca240c42791f9a3a6e547bedd410 
Xf86_video_intel:(master)2.99.916-52-g376037e6336dfc3b32c51b774ab8a80f64390e02
Libva:        (master)e0d25ece01e7aba819c910e98c4fb4706cdab055
Libva_intel_driver:(master)bc2e06ef0f89b264fe968fbff4f06e425385c3d8
Kernel:   (drm-intel-nightly)c5660b4ad395f1e34eacc22cf81c687edfc9c83c

Bug detailed description:
---------------------------
It fails on BSW with mesa master branch, works well on BDW.
Following cases also fail:
ES3-CTS.gtf.GL3Tests.draw_instanced.draw_instanced_mode
ES3-CTS.gtf.GL3Tests.instanced_arrays.instanced_arrays_many_instances
ES3-CTS.gtf.GL3Tests.primitive_restart.primitive_restart_incomplete
ES3-CTS.gtf.GL3Tests.primitive_restart.primitive_restart_mode

output:
dEQP Core GL-CTS-2.0 (0x0052484b) starting..
  target implementation = 'X11'

Test case 'ES3-CTS.gtf.GL3Tests.rgb8_rgba8.rgb8_rgba8_rgb'..
INFO:rgb8_rgba8_rgb:Solid color pixels expected. However, different values were
found.
ERROR:rgb8_rgba8_rgb:Gradient test detected insufficient framebuffer color
precision or faulty alpha values
  Fail (Fail)

DONE!

Test run totals:
  Passed:        0/1 (0.00%)
  Failed:        1/1 (100.00%)
  Not supported: 0/1 (0.00%)
  Warnings:      0/1 (0.00%)

Reproduce steps:
-------------------------
1. xinit
2. ./glcts --deqp-case=ES3-CTS.gtf.GL3Tests.rgb8_rgba8.rgb8_rgba8_rgb

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