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[Bug 566193] Re: luminosity screen on a laptop cannot be set

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Marc Bristiel <566193@xxxxxxxxxxxxxxxxxx>
Date: Wed, 14 Aug 2013 09:14:05 -0000
Reply-to: Bug 566193 <566193@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Since the computer affected by the bug is still run under 12.04 I can't
test the dev version.

Bug still exists in 12.04, "Linux [...] 3.2.0-51-generic #77-Ubuntu SMP
Wed Jul 24 20:21:10 UTC 2013 i686 i686 i386 GNU/Linux"

And workaround boot parameter "acpi_backlight=vendor" still works.

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https://bugs.launchpad.net/bugs/566193

Title:
  luminosity screen on a laptop cannot be set

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After upgrade from karmic to lucid, luminosity cannot be set on a
  laptop (Asus Pro 5JI).

  When pressing the luminosity keys, dmesg send the following output :

  8<-----------------------------------
  [  209.309032] ACPI Exception: AE_AML_BUFFER_LIMIT, Index (00000005D) is beyond end of object (20090903/exoparg2-445)
  [  209.309047] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.SBRG.EC0_.STBR] (Node f701bb28), AE_AML_BUFFER_LIMIT
  [  209.309115] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.VGA_.LCDD._BCM] (Node f7016cd8), AE_AML_BUFFER_LIMIT
  [  209.309186] ACPI Error: Evaluating _BCM failed (20090903/video-528)
  [  209.309192] ACPI: Failed to switch the brightness
  [  209.314634] ACPI Exception: AE_AML_BUFFER_LIMIT, Index (000000064) is beyond end of object (20090903/exoparg2-445)
  [  209.314643] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.SBRG.EC0_.STBR] (Node f701bb28), AE_AML_BUFFER_LIMIT
  [  209.314683] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.VGA_.LCDD._BCM] (Node f7016cd8), AE_AML_BUFFER_LIMIT
  [  209.314723] ACPI Error: Evaluating _BCM failed (20090903/video-528)
  [  209.315943] ACPI Exception: AE_AML_BUFFER_LIMIT, Index (00000005D) is beyond end of object (20090903/exoparg2-445)
  [  209.315952] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.SBRG.EC0_.STBR] (Node f701bb28), AE_AML_BUFFER_LIMIT
  [  209.315992] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.VGA_.LCDD._BCM] (Node f7016cd8), AE_AML_BUFFER_LIMIT
  [  209.316489] ACPI Error: Evaluating _BCM failed (20090903/video-528)
  [  209.325119] ACPI Exception: AE_AML_BUFFER_LIMIT, Index (000000064) is beyond end of object (20090903/exoparg2-445)
  [  209.325128] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.SBRG.EC0_.STBR] (Node f701bb28), AE_AML_BUFFER_LIMIT
  [  209.325167] ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.VGA_.LCDD._BCM] (Node f7016cd8), AE_AML_BUFFER_LIMIT
  [  209.325207] ACPI Error: Evaluating _BCM failed (20090903/video-528)
  8<-----------------------------------

  Error persists even after a reboot.

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