I have the same issue with my Asus UL20A

ACPI Exception: AE_AML_BUFFER_LIMIT, Index (00000005E) is beyond end of object 
(20090903/exoparg2-445)
ACPI Error (psparse-0537): Method parse/execution failed 
[\_SB_.PCI0.SBRG.EC0_.STBR] (Node ffff88007bb34ec0), AE_AML_BUFFER_LIMIT
ACPI Error (psparse-0537): Method parse/execution failed 
[\_SB_.PCI0.VGA_.LCDD._BCM] (Node ffff88007bb2f200), AE_AML_BUFFER_LIMIT
ACPI Error: Evaluating _BCM failed (20090903/video-528)
ACPI: Failed to switch the brightness
ACPI Exception: AE_AML_BUFFER_LIMIT, Index (00000005E) is beyond end of object 
(20090903/exoparg2-445)
ACPI Error (psparse-0537): Method parse/execution failed 
[\_SB_.PCI0.SBRG.EC0_.STBR] (Node ffff88007bb34ec0), AE_AML_BUFFER_LIMIT
ACPI Error (psparse-0537): Method parse/execution failed 
[\_SB_.PCI0.VGA_.LCDD._BCM] (Node ffff88007bb2f200), AE_AML_BUFFER_LIMIT
ACPI Error: Evaluating _BCM failed (20090903/video-528)
ACPI Exception: AE_AML_BUFFER_LIMIT, Index (000000064) is beyond end of object 
(20090903/exoparg2-445)
ACPI Error (psparse-0537): Method parse/execution failed 
[\_SB_.PCI0.SBRG.EC0_.STBR] (Node ffff88007bb34ec0), AE_AML_BUFFER_LIMIT
ACPI Error (psparse-0537): Method parse/execution failed 
[\_SB_.PCI0.VGA_.LCDD._BCM] (Node ffff88007bb2f200), AE_AML_BUFFER_LIMIT
ACPI Error: Evaluating _BCM failed (20090903/video-528)
ACPI Exception: AE_AML_BUFFER_LIMIT, Index (000000064) is beyond end of object 
(20090903/exoparg2-445)
ACPI Error (psparse-0537): Method parse/execution failed 
[\_SB_.PCI0.SBRG.EC0_.STBR] (Node ffff88007bb34ec0), AE_AML_BUFFER_LIMIT
ACPI Error (psparse-0537): Method parse/execution failed 
[\_SB_.PCI0.VGA_.LCDD._BCM] (Node ffff88007bb2f200), AE_AML_BUFFER_LIMIT
ACPI Error: Evaluating _BCM failed (20090903/video-528)

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luminosity screen on a laptop cannot be set
https://bugs.launchpad.net/bugs/566193
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