[Bug 47941] [snb] Backlight control broken between 3.6.0-rc1 and 3.6.0-rc4

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https://bugzilla.kernel.org/show_bug.cgi?id=47941

--- Comment #113 from Kamal Mostafa <kamal at canonical.com> ---
Created attachment 108941
  --> https://bugzilla.kernel.org/attachment.cgi?id=108941&action=edit
get edp info results

Jani, attached is the full drm.debug output from an XPS13 FHD IvyBridge with
your "get edp info" patch applied atop current post-3.12-rc1 mainline.  The new
EDPx dump may be less enlightening than you'd hoped though :-) ...

 [drm:intel_dp_get_dpcd], DPCD: 11 0a 02 00 00 00 00 00 00 00 00 00 00 00 00 
 [drm:intel_dp_get_dpcd], EDP1: 00 00 00 00 
 [drm:intel_dp_get_dpcd], EDP2: 00 00 00 00 00 00 00 00 00 
 [drm:intel_dp_get_dpcd], EDP3: 00 00 00 00 00 00 00 00 00 00 

(Fwiw, I get the same EDP-all-zeros result on a v3.8-stable kernel too).

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