bademux, thank you for reporting this and helping make Ubuntu better. Just to advise, in the future please do not compress/tar attachments as it makes it harder for developers and triagers to help you.
Despite this, could you please test the latest upstream kernel available from the very top line at the top of the page (the release names are irrelevant for testing, and please do not test the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. If the test did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested exactly shown as: kernel-fixed-upstream-3.18-rc7 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Summary changed: - Backlight doesn't work on Samsung np730U3E-S01PL + [Samsung NP730U3E-S01PL] LCD backlight doesn't work -- 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/1399823 Title: [Samsung NP730U3E-S01PL] LCD backlight doesn't work Status in linux package in Ubuntu: Incomplete Bug description: Backlight, no LCD, neither keyboard, doesn't work. echo 1 > /sys/class/backlight/intel_backlight/brightness #nothig changes echo 0 > /sys/class/backlight/intel_backlight/brightness #turns off LCD backlight there is no /proc/sys/video/use_native_backlight acpi_backlight =... # no effect at all # grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:8 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:8 grep: /sys/class/backlight/intel_backlight/device: Jest katalogiem /sys/class/backlight/intel_backlight/max_brightness:4650 grep: /sys/class/backlight/intel_backlight/power: Jest katalogiem grep: /sys/class/backlight/intel_backlight/subsystem: Jest katalogiem /sys/class/backlight/intel_backlight/type:raw # dmesg|grep 'ACPI: Video' [ 1.766081] ACPI: Video Device [PEGP] (multi-head: yes rom: no post: no) [ 1.767014] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no # lspci |grep VGA 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-25-generic 3.16.0-25.33 ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7 Uname: Linux 3.16.0-25-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: kasia 2021 F.... pulseaudio Date: Sat Dec 6 00:16:19 2014 HibernationDevice: RESUME=UUID=aa9f54d4-8ed7-4e2b-9107-8ffa2b36e88e InstallationDate: Installed on 2014-12-05 (0 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) MachineType: SAMSUNG ELECTRONICS CO., LTD. 730U3E/740U3E ProcEnviron: LANGUAGE=pl TERM=xterm PATH=(custom, no user) LANG=pl_PL.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-25-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash acpi_backlight=vendor vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.16.0-25-generic N/A linux-backports-modules-3.16.0-25-generic N/A linux-firmware 1.138 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/26/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P07ABW.065.140226.dg dmi.board.asset.tag: No Asset Tag dmi.board.name: NP730U3E-S01PL 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.:bvrP07ABW.065.140226.dg:bd02/26/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn730U3E/740U3E:pvrP07ABW:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP730U3E-S01PL:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: 730U3E/740U3E dmi.product.version: P07ABW dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. 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