Luis Angel Vicente Sanchez, as per http://www.dell.com/support/troubleshooting/us/en/19/Product/xps-13 -l321x-mlk an update is available for your BIOS (A09). If you update to this, does it change anything?
If not, could you please both specify what happened, and provide the output of the following terminal command: sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date Thank you for your understanding. ** Tags added: regression-update ** Description changed: After upgrading to 3.8.0-20.31 kernel my backlight control stopped working. It was working on previous versions of the kernel. I know other people reported this bug before and that 3.8.0-20.31 kernel was suppose to fix it; but in my case it was working before and this update broke it. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image (not installed) ProcVersionSignature: Ubuntu 3.8.0-20.31-generic 3.8.11 Uname: Linux 3.8.0-20-generic x86_64 ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: langelvs 1672 F.... pulseaudio + USER PID ACCESS COMMAND + /dev/snd/controlC0: langelvs 1672 F.... pulseaudio CRDA: - country DE: - (2400 - 2483 @ 40), (N/A, 20) - (5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR - (5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS - (5470 - 5725 @ 40), (N/A, 26), DFS + country DE: + (2400 - 2483 @ 40), (N/A, 20) + (5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR + (5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS + (5470 - 5725 @ 40), (N/A, 26), DFS Date: Mon May 13 00:00:44 2013 HibernationDevice: RESUME=UUID=532a06d0-3beb-47ba-977e-17b09d32f193 MachineType: Dell Inc. Dell System XPS L322X MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-20-generic root=UUID=79a15acb-470b-40a5-b2b6-118e7cbe0656 ro quiet splash vt.handoff=7 RelatedPackageVersions: - linux-restricted-modules-3.8.0-20-generic N/A - linux-backports-modules-3.8.0-20-generic N/A - linux-firmware 1.106 + linux-restricted-modules-3.8.0-20-generic N/A + linux-backports-modules-3.8.0-20-generic N/A + linux-firmware 1.106 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/22/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A07 dmi.board.name: 0PJHXN 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.:bvrA07:bd01/22/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: Dell System XPS L322X dmi.sys.vendor: Dell Inc. - --- - ApportVersion: 2.9.2-0ubuntu8 - Architecture: amd64 - DistroRelease: Ubuntu 13.04 - MarkForUpload: True - Package: linux (not installed) - Tags: raring - Uname: Linux 3.10.0-031000rc1-generic x86_64 - UnreportableReason: The running kernel is not an Ubuntu kernel - UpgradeStatus: No upgrade log present (probably fresh install) - UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers ** Attachment removed: "HookError_cloud_archive.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1179315/+attachment/3675583/+files/HookError_cloud_archive.txt ** Attachment removed: "ProcEnviron.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1179315/+attachment/3675584/+files/ProcEnviron.txt ** Tags removed: kernel-bug-exists-upstream ** Tags added: bios-outdated-a09 kernel-bug-exists-upstream-v3.10-rc1 needs-upstream-testing ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1179315 Title: [Dell XPS L322X] Backlight control problems (3.8.0-25-generic #37-Ubuntu SMP) Status in “linux” package in Ubuntu: Incomplete Bug description: After upgrading to 3.8.0-20.31 kernel my backlight control stopped working. It was working on previous versions of the kernel. I know other people reported this bug before and that 3.8.0-20.31 kernel was suppose to fix it; but in my case it was working before and this update broke it. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image (not installed) ProcVersionSignature: Ubuntu 3.8.0-20.31-generic 3.8.11 Uname: Linux 3.8.0-20-generic x86_64 ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: langelvs 1672 F.... pulseaudio CRDA: country DE: (2400 - 2483 @ 40), (N/A, 20) (5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR (5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS (5470 - 5725 @ 40), (N/A, 26), DFS Date: Mon May 13 00:00:44 2013 HibernationDevice: RESUME=UUID=532a06d0-3beb-47ba-977e-17b09d32f193 MachineType: Dell Inc. Dell System XPS L322X MarkForUpload: True ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-20-generic root=UUID=79a15acb-470b-40a5-b2b6-118e7cbe0656 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-20-generic N/A linux-backports-modules-3.8.0-20-generic N/A linux-firmware 1.106 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/22/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A07 dmi.board.name: 0PJHXN 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.:bvrA07:bd01/22/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: Dell System XPS L322X dmi.sys.vendor: Dell Inc. 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