i915 black screen introduced by ACPI changes

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

That did not work for me. Still have black screen on the tip of git.
I did that to the gurb2-efi.cfg
Here is my kernel cmdline:

$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.9.0-rc2+
root=UUID=75d90f06-bcdc-40c0-a3a3-7edf9af38d41 ro rd.md=0 rd.lvm=0
rd.dm=0 rd.luks=0 vconsole.keymap=us LANG=en_US.UTF-8 drm.debug=0xe
"acpi_osi=!Windows\x202012"

Chris


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