https://bugzilla.kernel.org/show_bug.cgi?id=16036


ykzhao <[email protected]> changed:

           What    |Removed                     |Added
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--- Comment #13 from ykzhao <[email protected]>  2010-09-20 07:23:35 ---
Hi, Shavkat
    From the acpidump it seems that there exists the _BCM/_BCL/_BQC object. But
after the _BCM object will write the requested brightness level to EC register,
the brightness can't be changed. Maybe this is related with the BIOS.

    When writing the value to IGD PCI config space, it will write the IGD
graphics backlight register. Maybe the incorrect ACPI backlight control
mechanism is exported on this box. 

Thanks.

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