https://bugzilla.kernel.org/show_bug.cgi?id=36322





--- Comment #15 from Joern Heissler <kernelb...@joern.heissler.de>  2011-06-03 
09:53:42 ---
(In reply to comment #13)
> Could you please also try acpi_osi="!Windows 2009"? maybe it also work like
> acpi_osi="Linux"?
acpi_osi="!Windows 2009" will cause OSYS==0x7D6,

with acpi_osi="Linux":
  ACPI: Added _OSI(Linux)
  [Firmware Bug]: ACPI: BIOS _OSI(Linux) query honored via cmdline
but OSYS==0x7d) is still set.

Brightness control does not work with either command line option.

(In reply to comment #14)
> I still want to know what _REAL_ way acer doing in Windows7, then we need find
> a way to do the same thing with Windows7.
> I don't thing they direct access BRXP in their driver, it's very dirty.
Maybe the intel video driver handels the acpi notification and then calls the
AINT method?
I don't have windows available to confirm this (or any other theory). Even if I
had, how would I reverse engineer it?

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