kernel-packages team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I'd like to perform a bisect to figure out what commit caused this
regression. We need to identify the earliest kernel where the issue
started happening as well as the latest kernel that did not have this
issue.

Can you test the following upstream kernels and report back?

v3.13.11.5: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.11.5-trusty/
v3.13.11.6: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.11.6-trusty/


** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: kernel-da-key regression-update

** Tags added: performing-bisect

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https://bugs.launchpad.net/bugs/1370365

Title:
  After the last `apt-get update` the screen backlight is turned off.

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Cause: After the last `apt-get update` and system `reboot` the screen backlight is turned off.
  Expected: The screen is expected to have the backlight turned on or at least to be able to set it on.

  Comment:
  The last update has updated the linux kernel and kernel headers package. After booting up with the new kerlnel the screen backlight has turned off after a second (right after the system boot). I have not found any way to torn it on, no mether if I increase or decrease the backlight setting and no mether if the system is working on batery or with the power cord attached.
  I am running Ubuntu Desktop 14.04 LTS at Dell Vostro-5470.

  $ uname -a
  Linux Vostro-5470 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  $ lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57 [modified: boot/vmlinuz-3.13.0-32-generic]
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  sebo       2267 F.... pulseaudio
   /dev/snd/pcmC1D0p:   sebo       2267 F...m pulseaudio
   /dev/snd/controlC0:  sebo       2267 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Sep 17 09:02:17 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-08-08 (39 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Vostro 5470
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-32-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/09/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: 0RYY7X
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd08/09/2013:svnDellInc.:pnVostro5470:pvr:rvnDellInc.:rn0RYY7X:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Vostro 5470
  dmi.sys.vendor: Dell Inc.

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