linux-kernel - Re: [Intel-gfx] i915 black screen introduced by ACPI changes

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Date:	Fri, 15 Mar 2013 02:00:10 -0700
From:	Chris Li <lkml@...isli.org>
To:	Jani Nikula <jani.nikula@...ux.intel.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>, len.brown@...el.com,
	feng.tang@...el.com, intel-gfx <intel-gfx@...ts.freedesktop.org>,
	linux-kernel@...r.kernel.org, robert.moore@...el.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [Intel-gfx] i915 black screen introduced by ACPI changes

On Fri, Mar 15, 2013 at 12:29 AM, Jani Nikula
<jani.nikula@...ux.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

Download attachment "i915_opregion.bad" of type "application/octet-stream" (22621 bytes)

Download attachment "i915_opregion.good" of type "application/octet-stream" (22621 bytes)