[Bug 90861] [HSW GT2 Regression ]Black screen after boot up machine

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90861

ye.tian <yex.tian at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #3 from ye.tian <yex.tian at intel.com> ---
By bisected, shows the first bad commit is 3bae26e.

commit 3bae26eb2991c00670df377cf6c3bc2b0577e82a
Author:     Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
AuthorDate: Mon Jun 1 12:50:03 2015 +0200
Commit:     Jani Nikula <jani.nikula at intel.com>
CommitDate: Thu Jun 4 11:43:36 2015 +0300

    drm/i915: Read hw state into an atomic state struct, v2.

    To make this work we load the new hardware state into the
    atomic_state, then swap it with the sw state.

    This lets us change the force restore path in setup_hw_state()
    to use a single call to intel_mode_set() to restore all the
    previous state.

    As a nice bonus this kills off encoder->new_encoder,
    connector->new_enabled and crtc->new_enabled. They were used only
    to restore the state after a modeset.

    Changes since v1:
    - Make sure all possible planes are added with their crtc set,
      so they will be turned off on first modeset.

    Signed-off-by: Ander Conselvan de Oliveira
<ander.conselvan.de.oliveira at intel.com>
    Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

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