[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 #105 from Yuan Chao <yuanchao at gmail.com> ---
Created attachment 126443
  --> https://bugs.freedesktop.org/attachment.cgi?id=126443&action=edit
proposed patch to store extra registers

Here is a proposed patch based on comment 14 of [Bug 97486].

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