Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug screen trusty vostro-5470
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https://bugs.launchpad.net/bugs/1370365
Title:
After the last `apt-get update` the screen backlight is turned off.
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