Note: this upstream patch looks interesting:
commit 90c53ca426cb93d15eefea79dcf6bd15ad3ffeb4
Author: Zhang Rui <[email protected]>
Date: Mon Aug 31 12:39:54 2009 -0400
ACPI video: work-around BIOS AML bug in _BQC
_BQC on some laptops returns an uninitialized value when it's
invoked for the first time.
Set the laptop to the maximum backlight level in this case.
http://bugzilla.kernel.org/attachment.cgi?id=22675
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Acer Aspire 5520 has backlight broken in Karmic Koala
https://bugs.launchpad.net/bugs/428910
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