Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.13 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'. 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/v4.13-rc7 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** 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/1713195 Title: Backlight Won't Adjust, Xorg Failures Status in linux package in Ubuntu: Incomplete Bug description: Previously had Ubuntu 16.04 installed on this machine, but I installed Xubuntu over it including formatting my partitions. I did not have issues with adjusting the brightness, getting the screen to show, or Xorg crashes prior to the second install (ie the Ubuntu worked fine). This bug falls under "Backlight control does not work and there are no entries in /sys/class/backlight" category. I also experience the Blank Screen at Startup issue, which is only remedied by adding nomodeset to the grub boot options. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-92-generic 4.4.0-92.115 ProcVersionSignature: Ubuntu 4.4.0-92.115-generic 4.4.76 Uname: Linux 4.4.0-92-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.10 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: sebastian 6377 F.... pulseaudio CurrentDesktop: XFCE Date: Fri Aug 25 22:42:52 2017 HibernationDevice: RESUME=UUID=14b7bd47-d085-4964-8823-eedc74c0391d InstallationDate: Installed on 2017-08-20 (6 days ago) InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) MachineType: Dell Inc. Inspiron 15-3552 ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-92-generic.efi.signed root=UUID=fe7fca66-0701-4ee1-bdfe-baf9f4bffcab ro nomodeset RelatedPackageVersions: linux-restricted-modules-4.4.0-92-generic N/A linux-backports-modules-4.4.0-92-generic N/A linux-firmware 1.157.11 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/26/2016 dmi.bios.vendor: Dell Inc. dmi.bios.version: 4.0.7 dmi.board.name: 0787MR dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvr4.0.7:bd04/26/2016:svnDellInc.:pnInspiron15-3552:pvr4.0.7:rvnDellInc.:rn0787MR:rvrA00:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: Inspiron 15-3552 dmi.product.version: 4.0.7 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1713195/+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
