[Bug 79813] [hsw bisected regression] Chromebook loses backlight control in 3.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79813

--- Comment #9 from Scot Doyle <lkml14 at scotdoyle.com> ---
/sys/kernel/debug/dri/0/i915_opregion has length 0 bytes under both 3.14.4
(where backlight works) and 3.15.0 (where it doesn't).

Just for the record (in regard to the kernel.org bugzilla report) apple_bl
isn't loaded on the chromebook.

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