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[Bug 1391758] Re: [Asus UX32VD] Backlight controls have no effect after suspend in most recent kernel


iasl -d dsdt.dat

Intel ACPI Component Architecture
ASL Optimizing Compiler version 20140214-64 [Mar 29 2014]
Copyright (c) 2000 - 2014 Intel Corporation

Loading Acpi table from file   dsdt.dat - Length 00082426 (0141FA)
Acpi table [DSDT] successfully installed and loaded
Pass 1 parse of [DSDT]
Pass 2 parse of [DSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)

Parsing completed

Found 2 external control methods, reparsing with new information
Pass 1 parse of [DSDT]
Pass 2 parse of [DSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)

Parsing completed
Disassembly completed
ASL Output:    dsdt.dsl - 707929 bytes

iASL Warning: There were 2 external control methods found during
disassembly, but additional ACPI tables to resolve these externals
were not specified. The resulting disassembler output file may not
compile because the disassembler did not know how many arguments
to assign to these methods. To specify the tables needed to resolve
external control method references, the -e option can be used to
specify the filenames. Example iASL invocations:
    iasl -e ssdt1.aml ssdt2.aml ssdt3.aml -d dsdt.aml
    iasl -e dsdt.aml ssdt2.aml -d ssdt1.aml
    iasl -e ssdt*.aml -d dsdt.aml

In addition, the -fe option can be used to specify a file containing
control method external declarations with the associated method
argument counts. Each line of the file must be of the form:
    External (<method pathname>, MethodObj, <argument count>)

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  [Asus UX32VD] Backlight controls have no effect after suspend in most
  recent kernel

Status in “linux” package in Ubuntu:

Bug description:
  After recent updates, the backlight doesn't work after suspend on my
  Asus UX32VD laptop. The hotkeys work as far as the Unity graphical
  indicator goes, but there is no change in backlight. The hotkeys used
  to work, and have worked for the last couple of years.

  Backlight is restored and does work after restarting, but can no
  longer be modified after suspend.

  This is the output from 
  ls /sys/class/backlight > backlight

  This is the output from 
  grep -r . /proc/acpi > acpi

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-39-generic 3.13.0-39.66
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic
  Uname: Linux 3.13.0-39-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
   /dev/snd/controlC0:  rasmus     2439 F.... pulseaudio
   /dev/snd/pcmC0D0p:   rasmus     2439 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Wed Nov 12 08:22:20 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=49ecb728-6268-4421-9baf-b50a95225410
  InstallationDate: Installed on 2012-08-10 (823 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=8f94976f-77a4-4e28-a0a8-2e0ce9149ef8 ro quiet splash pcie_aspm=force vt.handoff=7
   linux-restricted-modules-3.13.0-39-generic N/A
   linux-backports-modules-3.13.0-39-generic  N/A
   linux-firmware                             1.127.8
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: Upgraded to trusty on 2014-05-31 (164 days ago)
  dmi.bios.date: 06/06/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX32VD.206
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX32VD
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX32VD.206:bd06/06/2012:svnASUSTeKCOMPUTERINC.:pnUX32VD:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX32VD:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: UX32VD
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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