Alex Barattini, as per http://www.dell.com/support/drivers/us/en/19/Product/inspiron-15r-5521 an update is available for your BIOS (A12). If you update to this following https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it doesn't, could you please both specify what happened, and just provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Thank you for your understanding. ** This bug is no longer a duplicate of bug 1225811 [Dell Inspiron 15R 5521] Can't toggle backlight brightness ** Tags added: bios-outdated-a12 ** Changed in: linux (Ubuntu) Importance: Undecided => Low ** Changed in: linux (Ubuntu) Status: New => Incomplete ** Summary changed: - impossible to adjust the screen backlight + [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight ** Summary changed: - [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight + 8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight -- 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/1261853 Title: 8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight Status in “linux” package in Ubuntu: Incomplete Bug description: 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 13.10 Package: linux-image-3.11.0-14-generic 3.11.0-14.21 ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7 Uname: Linux 3.11.0-14-generic x86_64 ApportVersion: 2.12.5-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: alex 1443 F.... pulseaudio alex 11159 F.... pulseaudio Date: Tue Dec 17 18:50:13 2013 HibernationDevice: RESUME=UUID=04335018-6e1d-453d-a8ba-25ae1c34f2eb InstallationDate: Installed on 2013-12-14 (2 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: Dell Inc. Inspiron 5521 MarkForUpload: True ProcEnviron: LANGUAGE=it PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=it_IT.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic.efi.signed root=UUID=d4cdcfba-0a53-41d0-a9ce-0516d3fab0f0 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.11.0-14-generic N/A linux-backports-modules-3.11.0-14-generic N/A linux-firmware 1.116 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/22/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A06 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: A06 dmi.modalias: dmi:bvnDellInc.:bvrA06:bd02/22/2013:svnDellInc.:pnInspiron5521:pvrA06:rvnDellInc.:rn0K08H3:rvrA00:cvnDellInc.:ct8:cvrA06: dmi.product.name: Inspiron 5521 dmi.product.version: A06 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261853/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp