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


Output from 
$ acpixtract acpidump.txt

Intel ACPI Component Architecture
ACPI Binary Table Extraction Utility version 20140214-64 [Mar 29 2014]
Copyright (c) 2000 - 2014 Intel Corporation

Acpi table [DSDT] - 82426 bytes written to dsdt.dat
Acpi table [SSDT] - 2620 bytes written to ssdt1.dat
Acpi table [SSDT] - 3237 bytes written to ssdt2.dat
Acpi table [SSDT] - 152 bytes written to ssdt3.dat
Acpi table [SSDT] - 2332 bytes written to ssdt4.dat
Acpi table [SSDT] - 2512 bytes written to ssdt5.dat
Acpi table [SSDT] - 2706 bytes written to ssdt6.dat
Acpi table [SSDT] - 2131 bytes written to ssdt7.dat
Acpi table [SSDT] - 771 bytes written to ssdt8.dat
Acpi table [SSDT] - 281 bytes written to ssdt9.dat

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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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