** Description changed: - Backlight hotkeys are registered and OSD shows backlight level going up - and down but there is no effect on actual backlight level. + SRU Justification: + + Impact: + Backlight hotkeys are registered and OSD shows backlight level going up and down but there is no effect on actual backlight level. + + Fix: + Apply a system specific quirk to the kernel for this model. + + Testing: + TBD Following the debugging instructions here: <https://wiki.ubuntu.com/Kernel/Debugging/Backlight>, I have added the kernel boot parameter "acpi_backlight=vendor" and this makes the backlight work as expected. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: linux-image-3.0.0-12-generic 3.0.0-12.20 ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4 Uname: Linux 3.0.0-12-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. AplayDevices: - **** List of PLAYBACK Hardware Devices **** - card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog] - Subdevices: 1/1 - Subdevice #0: subdevice #0 + **** List of PLAYBACK Hardware Devices **** + card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog] + Subdevices: 1/1 + Subdevice #0: subdevice #0 ApportVersion: 1.23-0ubuntu3 Architecture: amd64 ArecordDevices: - **** List of CAPTURE Hardware Devices **** - card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog] - Subdevices: 1/1 - Subdevice #0: subdevice #0 + **** List of CAPTURE Hardware Devices **** + card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog] + Subdevices: 1/1 + Subdevice #0: subdevice #0 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: andrzej 1460 F.... pulseaudio + USER PID ACCESS COMMAND + /dev/snd/controlC0: andrzej 1460 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: - Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 47' - Mixer name : 'Realtek ALC269' - Components : 'HDA:10ec0269,144dc072,00100004' - Controls : 14 - Simple ctrls : 9 + Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 47' + Mixer name : 'Realtek ALC269' + Components : 'HDA:10ec0269,144dc072,00100004' + Controls : 14 + Simple ctrls : 9 Date: Sun Oct 16 19:15:03 2011 HibernationDevice: RESUME=UUID=86d5ebb5-f2d7-4c81-89f6-11aad8001fd9 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) MachineType: SAMSUNG ELECTRONICS CO., LTD. N150P ProcEnviron: - LANGUAGE=en_GB:en - PATH=(custom, no user) - LANG=en_GB.UTF-8 - SHELL=/bin/bash + LANGUAGE=en_GB:en + PATH=(custom, no user) + LANG=en_GB.UTF-8 + SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=828f538c-35f0-4bfb-b594-4d72b443e430 ro quiet splash vt.handoff=7 acpi_backlight=vendor RelatedPackageVersions: - linux-restricted-modules-3.0.0-12-generic N/A - linux-backports-modules-3.0.0-12-generic N/A - linux-firmware 1.60 + linux-restricted-modules-3.0.0-12-generic N/A + linux-backports-modules-3.0.0-12-generic N/A + linux-firmware 1.60 SourcePackage: linux StagingDrivers: brcmsmac brcmutil UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/20/2010 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: 01GT.M026.20101220.RHU dmi.board.asset.tag: SAMSUNG dmi.board.name: N150P dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: Not Applicable dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr01GT.M026.20101220.RHU:bd12/20/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnN150P:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnN150P:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A: dmi.product.name: N150P dmi.product.version: Not Applicable 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/875893 Title: Samsung N150 Plus backlight does not work with ACPI driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/875893/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
