[Bug 77856] New: [BDW]Piglit spec_OpenGL_3.0_clearbuffer-mixed-format fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77856

          Priority: medium
            Bug ID: 77856
          Assignee: idr at freedesktop.org
           Summary: [BDW]Piglit spec_OpenGL_3.0_clearbuffer-mixed-format
                    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: Broadwell
Libdrm:       
(master)libdrm-2.4.53-6-gd4083dc762a2974c35ecd16be995272bbb6d57b4
Mesa:        (master)34a68345e228b7cbc1bc6909704a89c08bf5368e
Xserver:   
(master)xorg-server-1.15.99.902-47-ge924034269532979f1e88947ee9c33d30461edae
Xf86_video_intel:(master)2.99.911-94-gbb5b21e34f6cbe44a249e566471754b45c500e60
Libva:        (staging)8577efbd3b1d4e8f113f78cf13d2182aa681b738
Libva_intel_driver:(staging)42258e128f19b93aa102672d5f61eb73d9f9808f
Kernel:    (drm-intel-nightly)1e771b84e47085ef9b6efea1321e7cb5a8b2c065

Bug detailed description:
-----------------------------
It fails on Broadwell with Mesa master branch, but works well on Haswell.
output:
libGL: screen 0 does not appear to be DRI3 capable
libGL: pci id for fd 4: 8086:1616, driver i965
libGL: OpenDriver: trying /opt/X11R7/lib/dri/i965_dri.so
Probe color at (0,0)
  Expected: 0.500000 0.300000 0.700000 0.000000
  Observed: 0.000000 0.000000 0.000000 0.000000
  from color attachment 0.
Probe color at (0,0)
  Expected: 0.800000 0.000000 0.200000 1.000000
  Observed: 0.000000 0.000000 0.000000 0.000000
  from color attachment 1.
Probe color at (0,0)
  Expected: 1.200000 -2.900000 0.200000 5.800000
  Observed: -nan -nan -nan 0.000000
  from color attachment 2.
Probe color at (0,0)
  Expected: 0.500000 2.500000 -5.200000 1.000000
  Observed: -nan -nan -nan 0.000000
  from color attachment 3.
Probe color at (0,0)
  Expected: 10 90 100 150
  Observed: 255 255 255 50
  from color attachment 4.
Probe color at (0,0)
  Expected: 15 25 20 15
  Observed: 4294967246 4294967246 4294967246 50
  from color attachment 5.
Probe color at (0,0)
  Expected: 100 190 200 -15
  Observed: -50 -50 -50 50
  from color attachment 6.
PIGLIT: {'result': 'fail' }


Reproduce steps:
----------------------------
1. xinit
2. ./bin/clearbuffer-mixed-format -fbo -auto

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