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Message #18935
[Bug 1225811] Re: [Dell Inspiron 15R 5521] Can't toggle backlight brightness
Bug tested and confirmed on 3.12.0-031200rc3-generic.
Nb: please note the previous mentioned bug is slightly linked to this
one.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream
** Tags added: kernel-bug-exists-upstream-3.12.0-031200rc3-generic
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https://bugs.launchpad.net/bugs/1225811
Title:
[Dell Inspiron 15R 5521] Can't toggle backlight brightness
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
Since raring at least, it is not possible to setup backlight lightness
without adding acpi_backlight=vendor into grub boot option.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-generic 3.11.0.7.8
ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0
Uname: Linux 3.11.0-5-generic x86_64
ApportVersion: 2.12.1-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: nicolas 2839 F.... pulseaudio
Date: Mon Sep 16 02:05:10 2013
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=173db09c-bffc-4da9-ab42-7ca73f84e71f
InstallationDate: Installed on 2013-04-08 (160 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: Dell Inc. Inspiron 5521
MarkForUpload: True
ProcFB:
0 inteldrmfb
1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=09af3e13-8004-48fa-b0fe-116acbf8d3d7 ro crashkernel=384M-2G:64M,2G-:128M quiet splash acpi_backlight=vendor vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.11.0-5-generic N/A
linux-backports-modules-3.11.0-5-generic N/A
linux-firmware 1.114
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: Upgraded to saucy on 2013-06-24 (83 days ago)
dmi.bios.date: 06/25/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 0HK2KG
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A09
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/25/2013:svnDellInc.:pnInspiron5521:pvrA09:rvnDellInc.:rn0HK2KG:rvrA00:cvnDellInc.:ct8:cvrA09:
dmi.product.name: Inspiron 5521
dmi.product.version: A09
dmi.sys.vendor: Dell Inc.
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References