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[Bug 1173725] Re: [Acer Aspire V5-171] Backlight cannot be adjusted unless passing acpi_backlight=vendor

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Nils Sabelstrom <nilssab@xxxxxxxxx>
Date: Thu, 29 May 2014 05:38:54 -0000
Reply-to: Bug 1173725 <1173725@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Bug can be confirmed present in 14.04 with standard LTS kernel and
3.15rc2 kernel from ubuntu mainline kernel-ppa, daily build for april
24th (latest marked trusty at the time, now nonexistent, should I try a
newer kernel even if marked utopic?)

I tried upgrading to bios version 2.21, but there was only an installer
for win 8, and using it removes the ubuntu boot loader. Will post after
getting my computer to boot ubuntu again.. (I would not recommend users
without good knowledge of how UEFI bootloaders work to try upgrading the
bios)

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https://bugs.launchpad.net/bugs/1173725

Title:
  [Acer Aspire V5-171] Backlight cannot be adjusted unless passing
  acpi_backlight=vendor

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

Bug description:
  The boot parameter is suggested as a fix for this model by
  http://www.linlap.com/acer_aspire_v5-171

  (so if it would help, I would suggest classing this bug as
  "confirmed").

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified: boot/vmlinuz-3.8.0-19-generic]
  ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alan       1919 F.... pulseaudio
  Date: Sat Apr 27 19:59:23 2013
  InstallationDate: Installed on 2013-04-27 (0 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer V5-171
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic.efi.signed root=UUID=ad03cbd3-39e0-4f7e-b0ab-e1ef3abaa88e ro acpi_backlight=vendor quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-19-generic N/A
   linux-backports-modules-3.8.0-19-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/14/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.04
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Mimic
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.04
  dmi.modalias: dmi:bvnAcer:bvrV2.04:bd09/14/2012:svnAcer:pnV5-171:pvrV2.04:rvnAcer:rnMimic:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.04:
  dmi.product.name: V5-171
  dmi.product.version: V2.04
  dmi.sys.vendor: Acer

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