[Intel-gfx] i915 black screen introduced by ACPI changes

[Chris Li]

On Fri, Mar 15, 2013 at 12:29 AM, Jani Nikula
<jani.nikula at linux.intel.com> wrote:
> Fun. The BIOS seems to ask for zero backlight. Maybe it means something
> else for Windows 8. White is the new black or something.

Interesting.

>
> Just one idea, please attach hexdumps of
> /sys/kernel/debug/dri/0/i915_opregion (with debugfs mounted there,
> obviously) for both kernels. Maybe we're missing something there that
> the BIOS thinks Windows 8 should handle.

Two kernels have different dump. BTW I have switched to tip of git again.
Last pull from the git seems fix the can't boot problem.
I attach the files here. The good one is tip with win8 acpi revert.

Chris
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