** Attachment added: "results.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+attachment/4445247/+files/results.log
** Description changed: Control of screen backlight is broken with a default clean install of - Ubuntu 15.04 on my Samsung Series 7 Laptop (NP770Z5E). Setting kernal - parameter acpi_backlight=vendor fixes the issue after two reboots. + Ubuntu 15.04 on my Samsung Series 7 Laptop (NP770Z5E). Setting kernel + parameter 'acpi_backlight=vendor' fixes the issue after two reboots. Debugging information attached as per - https://wiki.ubuntu.com/Kernel/Debugging/Backlight ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-25-generic 3.19.0-25.26 ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2 Uname: Linux 3.19.0-25-generic x86_64 ApportVersion: 2.17.2-0ubuntu1.2 Architecture: amd64 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: mark 1699 F.... pulseaudio + USER PID ACCESS COMMAND + /dev/snd/controlC0: mark 1699 F.... pulseaudio Date: Sat Aug 15 21:36:20 2015 HibernationDevice: RESUME=UUID=c4899b44-3e19-4e62-921d-cf0a1cef97ec InstallationDate: Installed on 2015-08-12 (3 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: SAMSUNG ELECTRONICS CO., LTD. 770Z5E/780Z5E ProcFB: - 0 inteldrmfb - 1 radeondrmfb + 0 inteldrmfb + 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-25-generic root=UUID=5a02817b-1f9b-4abc-93a3-b10d5d9278ed ro quiet splash acpi_backlight=vendor vt.handoff=7 PulseList: - Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied - No PulseAudio daemon running, or not running as session daemon. + Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied + No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: - linux-restricted-modules-3.19.0-25-generic N/A - linux-backports-modules-3.19.0-25-generic N/A - linux-firmware 1.143.3 + linux-restricted-modules-3.19.0-25-generic N/A + linux-backports-modules-3.19.0-25-generic N/A + linux-firmware 1.143.3 SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/05/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P05ABU.142.130905.SK dmi.board.asset.tag: No Asset Tag dmi.board.name: NP770Z5E-S02UK dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: SEC_SW_REVISION_1234567890ABCD dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP05ABU.142.130905.SK:bd09/05/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn770Z5E/780Z5E:pvrP05ABU:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP770Z5E-S02UK:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: 770Z5E/780Z5E dmi.product.version: P05ABU dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1485246 Title: Backlight issue - Samsung Chronos 7 (model - NP770Z5E) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485246/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
