8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight

[Alex Barattini]

WORKAROUND: add video.use_native_backlight=1 to kernel cmdline

the change in the level of illumination of the screen, through the corresponding option in the control panel, has no effect.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-23-generic 3.13.0-23.45
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: alex 2122 F.... pulseaudio
 /dev/snd/pcmC0D0p: alex 2122 F...m pulseaudio
CurrentDesktop: Unity
Date: Tue Apr 8 22:14:22 2014
HibernationDevice: RESUME=UUID=f298bdcb-dec7-4870-a147-d0899d622706
InstallationDate: Installed on 2014-04-02 (5 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
MachineType: Dell Inc. Inspiron 5521
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-23-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-23-generic N/A
 linux-backports-modules-3.13.0-23-generic N/A
 linux-firmware 1.127
SourcePackage: linux
StagingDrivers: rts5139
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/25/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 0K08H3
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A12
dmi.modalias: dmi:bvnDellInc.:bvrA12:bd10/25/2013:svnDellInc.:pnInspiron5521:pvrA12:rvnDellInc.:rn0K08H3:rvrA00:cvnDellInc.:ct8:cvrA12:
dmi.product.name: Inspiron 5521
dmi.product.version: A12
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.14 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.14-trusty/

[Alex Barattini (alex.barattini)]

WORKAROUND: add video.use_native_backlight=1 to kernel cmdline

[penalvch (penalvch)]

Alex Barattini, the issue you are reporting is an upstream one. Could you please report this problem through the appropriate channel by following the instructions _verbatim_ at https://wiki.ubuntu.com/Bugs/Upstream/kernel ?

Please provide a direct URL to your e-mail to the mailing list once you have made it so that it may be tracked.

Thank you for your understanding.