[Bug 78515] New: [regression bisected IVB] piglit read-front test fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78515

          Priority: medium
            Bug ID: 78515
                CC: idr at freedesktop.org
          Assignee: kenneth at whitecape.org
           Summary: [regression bisected IVB] piglit read-front test fails
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: idr at freedesktop.org
          Hardware: All
            Status: NEW
           Version: git
         Component: Drivers/DRI/i965
           Product: Mesa

On my Thinkpad X230 I get:

[idr at mumford-wire piglit]$ bin/read-front -auto 
Mesa warning: couldn't open libtxc_dxtn.so, software DXTn
compression/decompression unavailable
Probe color at (0,0)
  Expected: 0.000000 0.000000 1.000000
  Observed: 0.000000 0.000000 0.000000
Probe color at (0,75)
  Expected: 0.000000 1.000000 0.000000
  Observed: 0.000000 0.000000 0.000000
PIGLIT: {'result': 'fail' }

This bisected to:

commit cde8bad1c9363ee293ae7844bcecb6179426ea65
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Mon May 5 11:02:18 2014 -0700

    i965: Always intel_prepare_render() after invalidating front buffers.

    Fixes glean/texture_srgb, which hit recursive-flush prevention
    assertions in vbo_exec_FlushVertices.

    This probably hurts the performance of front buffer rendering, but
    very few people in their right mind do front buffer rendering.

    Fixes Glean's texture_srgb test.

    Cc: "10.2" <mesa-stable at lists.freedesktop.org>
    Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
    Acked-by: Anuj Phogat <anuj.phogat at gmail.com>
    Reviewed-by: Eric Anholt <eric at anholt.net>

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