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[Alan Jenkins <alan.christopher.jenkins@xxxxxxxxxxxxxx>]

Sorry, I don't think the backlight problem on the V5-171 is a
regression.  I've never had it work as expected.

I've now tried the acpi_osi="!Windows 2012" test, to see if this machine
could be added to the temporary blacklist.  I.e. whether my bug was a
regression caused when Linux added the "Windows 2012" OSI string.[1]
Unfortunately that boot option didn't help.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=51231#c137

The result from testing v3.11-rc2 is that it does fix the problem.  And
as expected, the revert in v3.11-rc3 breaks it again.

To answer the question about firmware upgrades, I'm not going to try
that unless it helps upstream.  It's not worth reflashing "at my own
risk" just to avoid passing acpi_backlight=vendor.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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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