Christopher, thanks for your support, but I believe that this is a very well documented issue with remedies like typing "echo 0 > /sys/class/backlight/intel_backlight/brightness" on the command line solves.
The big issue is that after the computer resumes from suspend, the brightness go 100% and the keyboard commands for brightness can't change the brightness until the command I stated above is executed on terminal. As I said, it was fixed in the kernels 3.8.0 - 3.13.7 and the bug was reintroduced on the kernel 3.14.0 and I can also inform that it is on kernel 3.14.1 and 3.15.rc1. I will wait until Apr 17th to upgrade my Ubuntu 14.04 and see how it behaves. I will report the issues/success here. As for now, I am back to kernel 3.13. -- 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/1169376 Title: 8086:0166 [Dell XPS 13 L322X] backlight stopped working after update 3.8.0-18.28 Status in Dell Sputnik: Confirmed Status in “linux” package in Ubuntu: Incomplete Bug description: I'm on 13.04 beta 2 and I've been updating daily. After today's update, I was asked to restart and, after the restart, the backlight stopped working. What's worse is that the backlight is stuck in the lowest possible setting. I can barely see enough to type out this bug report. This is not a hardware problem. When I restart the computer the backlight turns on property but burns off when the Ubuntu encryption screen comes up (I'm using full disk encryption). Please fix this as soon as possible. XPS 13 version: L322x Display version: FHD (1080p) --- ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: cr45h 1901 F.... pulseaudio DistroRelease: Ubuntu 13.04 HibernationDevice: RESUME=UUID=a5d2ab8b-a068-4a69-95a6-b4e955b290f5 InstallationDate: Installed on 2013-04-08 (9 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130402.1) MachineType: Dell Inc. Dell System XPS L322X MarkForUpload: True Package: linux (not installed) ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-18-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.8.0-18.28-generic 3.8.6 RelatedPackageVersions: linux-restricted-modules-3.8.0-18-generic N/A linux-backports-modules-3.8.0-18-generic N/A linux-firmware 1.105 Tags: raring Uname: Linux 3.8.0-18-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo 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. To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1169376/+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
