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Date: Tue, 19 Mar 2013 01:13:44 -0700
Message-ID: <CANeU7QnxVFZ6vXA2a9oZvxu5iEtFD6weANJiUp__RejFWaoX=A@mail.gmail.com>
Subject: Re: [Intel-gfx] i915 black screen introduced by ACPI changes
From: Chris Li <lkml@chrisli.org>
To: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>, len.brown@intel.com,
        feng.tang@intel.com, intel-gfx <intel-gfx@lists.freedesktop.org>,
        linux-kernel@vger.kernel.org, robert.moore@intel.com,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Zhang Rui <rui.zhang@intel.com>
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On Fri, Mar 15, 2013 at 12:29 AM, Jani Nikula
<jani.nikula@linux.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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