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

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Date:	Tue, 19 Mar 2013 01:13:44 -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:
> I've never used the acpi_osi= kernel parameter, but it looks like you
> could workaround this with acpi_osi="!Windows 2012". Please check that
> running the "bad" kernel.

I find out that I just can't set the acpi_osi="!Windows 2012" properly
in grub2.cfg.
Grub2 will second guess the quote and change it. So it end up Linux kernel will
 see "acpi_osi=!Windows\x202012" or some thing like that.

However, I just find out that if I set acpi_osi=Linux the black screen
will go away.
That is one usable work around on the stock fedora kernel.

Chris
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