I bisected this

d3f281cf0493885d92ffc8e2c9e7e4e6d838d6a5 is the first bad commit
commit d3f281cf0493885d92ffc8e2c9e7e4e6d838d6a5
Author: Daniel Vetter <daniel.vet...@ffwll.ch>
Date:   Fri Aug 10 11:10:20 2012 +0200

    drm/i915: ignore eDP bpc settings from vbt
    
    BugLink: http://bugs.launchpad.net/bugs/1049899
    
    commit 4344b813f105a19f793f1fd93ad775b784648b95 upstream.
    
    This has originally been introduced to not oversubscribe the dp links
    in
    
    commit 885a5fb5b120a5c7e0b3baad7b0feb5a89f76c18
    Author: Zhenyu Wang <zhen...@linux.intel.com>
    Date:   Tue Jan 12 05:38:31 2010 +0800
    
        drm/i915: fix pixel color depth setting on eDP
    
    Since then we've fixed up the dp link bandwidth calculation code and
    should now automatically fall back to 6bpc dithering. So this is
    unnecessary.
    
    Furthermore it seems to break the new MacbookPro with retina display,
    hence let's just rip this out.
    
    Reported-by: Benoit Gschwind <gschw...@gnu-log.net>
    Cc: Benoit Gschwind <gschw...@gnu-log.net>
    Cc: Francois Rigaut <frig...@gmail.com>
    Cc: Greg KH <gre...@linuxfoundation.org>
    Tested-by: Benoit Gschwind <gschw...@gnu-log.net>
    Tested-by: Bernhard Froemel <froemel at vmars tuwien.ac.at>
    Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>
    
    --
    
    Testing feedback highgly welcome, and thanks for Benoit for finding
    out that the bpc computations are busted.
    -Daniel
    Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
    Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesin...@canonical.com>

:040000 040000 9f64f0229b57f38a83c5a7040d6202557dc63940
53dc0ef26bef49a62dbdd317e218c05bf9330d62 M      drivers

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