https://bugzilla.kernel.org/show_bug.cgi?id=14216





--- Comment #43 from Zhang Rui <rui.zh...@intel.com>  2010-09-27 01:18:54 ---
we have several bug reports that ACPI video driver controls the backlight
correctly, but the backlight fails to change after evaluating the AML code.
We have no idea what is going wrong here, and how to fix it.
A alternative way is to disable ACPI video driver and control the backlight in
other ways, like, platform specific control methods, the legacy PCI register,
etc.

I'm planning to write a backlight generic driver which can switch between the
backlight drivers when ACPI video driver, which is the default one, doesn't
work.

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