[Bug 81140] [HSW/BYT/BDW Bisected ]system sporadically boot fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81140

--- Comment #11 from liulei <lei.a.liu at intel.com> ---
Here is the first bad commit. I must be a very lucky guy, yesterday,because I
have tested this commit but it worked well!!!! 
commit 1bb9e632a0aeee1121e652ee4dc80e5e6f14bcd2
Author:     Daniel Vetter <daniel.vetter at ffwll.ch>
AuthorDate: Tue Jul 8 10:02:43 2014 +0200
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Wed Jul 9 09:52:13 2014 +0200

    drm/i915: Only unbind vgacon, not other console drivers

    The console subsystem only provides a function to switch to a given
    console, but we want to actually only switach away from vgacon.
    Unconditionally switching to the dummy console resulted in switching
    away from fbcon in multi-gpu setups when other gpu drivers are loaded
    before i915.

    Then either the reinitialization of fbcon when i915 registers its
    fbdev emulation or the teardown of the fbcon driver killed the
    machine. So only switch to the dummy console when it's required.

    Kudos to Chris for the original idea, I've only refined it a bit to
    still unregister vgacon even when it's currently unused.

    This regression has been introduced in

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