This should be fixed in the upstream 3.19 kernel by this patch author Aaron Lu committer Rafael J. Wysocki commit 7d0b93499f4879ddbc75d594f4ea216ba964f78e (patch) tree 7c65587b844e6709d4301599e67505c9335de1cb parent 97bf6af1f928216fd6c5a66e8a57bfa95a659672 (diff)
ACPI / video: Add some Samsung models to disable_native_backlight list Several Samsung laptop models (SAMSUNG 870Z5E/880Z5E/680Z5E and SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V) do not have a working native backlight control interface so restore their acpi_videoX interface. Link: https://bugzilla.kernel.org/show_bug.cgi?id=84221 Link: https://bugzilla.kernel.org/show_bug.cgi?id=84651 For SAMSUNG 870Z5E/880Z5E/680Z5E: Reported-and-tested-by: Brent Saner Reported-by: Vitaliy Filippov Reported-by: Laszlo KREKACS For SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V: Reported-by: Vladimir Perepechin Cc: 3.17+ <sta...@vger.kernel.org> # 3.17+ Signed-off-by: Aaron Lu Signed-off-by: Rafael J. Wysocki A PPA of the 3.19-rc3 kernel is available at http://kernel.ubuntu.com /~kernel-ppa/mainline/ and instructions on how to install and uninstall it are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds ** Bug watch added: Linux Kernel Bug Tracker #84221 http://bugzilla.kernel.org/show_bug.cgi?id=84221 ** Bug watch added: Linux Kernel Bug Tracker #84651 http://bugzilla.kernel.org/show_bug.cgi?id=84651 -- 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/1380824 Title: Backlight not working on Samsung ATIV 8 laptop Status in linux package in Ubuntu: Incomplete Bug description: I have a 15" Samsung ATIV Book 8 laptop, np870z5e model from 2013. It features an Intel core-i7 cpu, and integrated Intel Hd4000 video card and also an ATI Radeon video card. According to Backlight debugging page[1], my case is "Backlight control does not work, but there are entries in /sys/class/backlight. " What works: Fn-F2, Fn-F3 keys works(Brightness down, brightness up), shows the brightness notification dialog, and also the /sys/class/backlight/intel_backlight/actual_brightness file changes too. It has no physical effect. It does not have any physical effect (brightness does not change), up until the brightness notification is zero (no bar on it), then the display switches off. raising the brightness switches the display back to the same brightness it was, and still not have any effect to the brightness. Semi works: Powering on the laptop starts with about 60% brightness. If I suspend-resume the laptop, it results 100% brightness. If I unplug the power cord (if it was plugged in when the laptop started), then it results 100% brightness. If I plug the power cord (if it was unplugged when the laptop started), then it results 100% brightness. I can't change the 100% brightness afterwards. What I have tried: a) xorg.conf file: # Fix Backlight issue Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection No effect. b) Kernel boot parameter in /etc/defaults/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video.use_native_backlight=1" GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video.use_native_backlight=0" GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video.use_bios_initial_backlight=0" I tried each one, with a power off - power on cycle, but none of it had any effect. I doublechecked it (after boot), with cat /proc/cmdline. Changing the /sys/class/backlight/intel_backlight/brightness values, has no physical effect, although the file do change (checked with cat). I'm desperately trying to solve this issue, because the screen is always at full brightness, and burns my eyes out. (300cd/m2 screen is extremely bright). Any help is much appreciated. [1]: https://wiki.ubuntu.com/Kernel/Debugging/Backlight ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-21-generic 3.16.0-21.28 ProcVersionSignature: Ubuntu 3.16.0-21.28-generic 3.16.4 Uname: Linux 3.16.0-21-generic x86_64 ApportVersion: 2.14.7-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: lama 2528 F.... pulseaudio CurrentDesktop: Unity Date: Tue Oct 14 00:38:17 2014 InstallationDate: Installed on 2014-01-13 (273 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: SAMSUNG ELECTRONICS CO., LTD. 870Z5E/880Z5E/680Z5E ProcFB: 0 inteldrmfb 1 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-21-generic.efi.signed root=UUID=ba121a25-b094-49f5-96bf-ade769938060 ro quiet splash video.use_bios_initial_backlight=0 vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.16.0-21-generic N/A linux-backports-modules-3.16.0-21-generic N/A linux-firmware 1.135 SourcePackage: linux UpgradeStatus: Upgraded to utopic on 2014-10-08 (5 days ago) dmi.bios.date: 06/04/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P02ADH.008.130604.SK dmi.board.asset.tag: No Asset Tag dmi.board.name: NP870Z5E-X01HU 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.:bvrP02ADH.008.130604.SK:bd06/04/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn870Z5E/880Z5E/680Z5E:pvrP02ADH:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP870Z5E-X01HU:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: 870Z5E/880Z5E/680Z5E dmi.product.version: P02ADH dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. 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