[Bug 90212] New: [BDW-Y regression] Screen flicker when start X with FBC enable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90212

            Bug ID: 90212
           Summary: [BDW-Y regression] Screen flicker when start X with
                    FBC enable
           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: yex.tian at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==       
-----------------------------------------------------
Regression: Yes 
Bad  2015_04_28/drm-intel-next-queued/de4de566f84b87f4d5f8265b11932088adb19896
Good 2015_01_30/drm-intel-next-queued/b8d24a06568368076ebd5a858a011699a97bfa42
Non-working platforms: BDW-Y  Lenovo Yoga 3 pro-1370

==Kernel==
--------------------------------------------------
commit de4de566f84b87f4d5f8265b11932088adb19896
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Apr 23 22:02:54 2015 +0200

    drm/i915: Update DRIVER_DATE to 20150423

    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

==Bug detailed description==
--------------------------------------------------
Screen flicker when start X with FBC enable, next-queued and nightly branch is
bad, fixes branch is good.
==Reproduce steps==
----------------------------
1, boot machine
2, start X

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