http://bugzilla.kernel.org/show_bug.cgi?id=12249





------- Comment #13 from tetrom...@gmail.com  2008-12-19 00:06 -------
First: it seems that your customized DSDT produces a lot of error messages.

[   32.209855] ACPI Exception (exoparg2-0444): AE_AML_BUFFER_LIMIT, Index
(0000000FF) is beyond end of object [20080926]
[   32.209874] ACPI Error (psparse-0524): Method parse/execution failed
[\_SB_.PCI0.SBRG.EC0_.STBR] (Node ffff88013fa35e40), AE_AML_BUFFER_LIMIT
[   32.210030] ACPI Error (psparse-0524): Method parse/execution failed
[\_SB_.PCI0.VGA_.LCDD._BCM] (Node ffff88013fa303e0), AE_AML_BUFFER_LIMIT
[   32.608059] ACPI Exception (exoparg2-0444): AE_AML_BUFFER_LIMIT, Index
(0000000FF) is beyond end of object [20080926]
[   32.608066] ACPI Error (psparse-0524): Method parse/execution failed
[\_SB_.PCI0.SBRG.EC0_.STBR] (Node ffff88013fa35e40), AE_AML_BUFFER_LIMIT
[   32.608181] ACPI Error (psparse-0524): Method parse/execution failed
[\_SB_.PCI0.VGA_.LCDD._BCM] (Node ffff88013fa303e0), AE_AML_BUFFER_LIMIT
[   32.906924] usbcore: registered new interface driver uvcvideo
[   32.906932] USB Video Class driver (v0.1.0)
[   32.982373] ACPI Exception (exoparg2-0444): AE_AML_BUFFER_LIMIT, Index
(0000000FF) is beyond end of object [20080926]
[   32.982381] ACPI Error (psparse-0524): Method parse/execution failed
[\_SB_.PCI0.SBRG.EC0_.STBR] (Node ffff88013fa35e40), AE_AML_BUFFER_LIMIT
[   32.982431] ACPI Error (psparse-0524): Method parse/execution failed
[\_SB_.PCI0.VGA_.LCDD._BCM] (Node ffff88013fa303e0), AE_AML_BUFFER_LIMIT

and so on for hundreds of lines


Second: after applying video debug patch and running "cat
/sys/class/backlight/acpi_video0/actual_brightness", I get the following line
in dmesg:

[ 4083.709874] Rui: current level is 255, brightness count is 18


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