[Bug 67454] After suspend/resume, screen is black for all but the highest levels with i915 driver on MacBook Air 6,2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67454

--- Comment #44 from Jani Nikula <jani.nikula at intel.com> ---
Created attachment 87227
  --> https://bugs.freedesktop.org/attachment.cgi?id=87227&action=edit
save/restore some more backlight registers

Here's a patch to try, mostly for the sake of trying something, as there's no
evidence this should help.

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