http://bugzilla.kernel.org/show_bug.cgi?id=9902





------- Comment #26 from [EMAIL PROTECTED]  2008-07-06 20:07 -------
According to the acpidump attached,
if acpi_osi="Windows 2006", the AML code tries to find out a LCD device (devide
id equals 0x0400) to send the event to, unfortunately, it fails to find any and
this is why no ACPI events when pressing hotkey.
if acpi_osi="!Windows 2006", the AML code uses the legacy way (poking LBB
register in the graphics device's pci config space) to change the backlight
directly.

Please attach the output of "grep . /proc/acpi/video/GFX0/*/*".


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