** Description changed: The problem appears in console mode only and it is that the backlight cannot be controlled with the Fn keys. It can neither be adjusted nor - turned off. - - The machine runs Ubuntu Server 12.04.1 LTS and is Samsung N220 netbook - with a sun readable PixelQi display. - - uname -a : - Linux clterm 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux + turned off. The Samsung N220 netbook runs Ubuntu Server 12.04.1 LTS and + has a sun readable PixelQi display. ls /sys/class/backlight : intel_backlight samsung I have put acpi_backlight=vendor kernel parameter as setting acpi video backlight does not have any effect. - This works ok: - echo 200 |sudo dd of=/sys/class/backlight/intel_backlight/brightness - - This also works ok: + WORKAROUND: echo 200 |sudo dd of=/sys/class/backlight/intel_backlight/brightness echo 4 |sudo dd of=/sys/class/backlight/samsung/brightness The above commands work differently though. The first one allows controlling in great ranges, while the second controls the backlight within some bounds. - With acpi=off, the Fn keys function correctly in the console. + WORKAROUND: With the following kernel parameter the Fn keys function correctly: + acpi=off - Your help is appreciated! - --- + --- AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.0.1-0ubuntu15.1 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Error: [Errno 2] No such file or directory Card0.Amixer.values: Error: [Errno 2] No such file or directory DistroRelease: Ubuntu 12.04 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=5222a4fe-9efb-4de0-823d-82a44027cb1f InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3) MachineType: SAMSUNG ELECTRONICS CO., LTD. N150/N210/N220 MarkForUpload: True Package: linux (not installed) ProcEnviron: - TERM=linux - PATH=(custom, no user) - LANG=en_US.UTF-8 - SHELL=/bin/bash + TERM=linux + PATH=(custom, no user) + LANG=en_US.UTF-8 + SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-29-generic root=UUID=a357370c-979e-45c4-954b-0d62b3dc9df5 ro acpi_backlight=vendor ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24 RelatedPackageVersions: - linux-restricted-modules-3.2.0-29-generic N/A - linux-backports-modules-3.2.0-29-generic N/A - linux-firmware 1.79.1 + linux-restricted-modules-3.2.0-29-generic N/A + linux-backports-modules-3.2.0-29-generic N/A + linux-firmware 1.79.1 RfKill: Error: [Errno 2] No such file or directory Tags: precise Uname: Linux 3.2.0-29-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 03/25/2010 dmi.bios.vendor: Phoenix Technologies Ltd. dmi.bios.version: 08JI.M073.20100325.JIP dmi.board.asset.tag: SAMSUNG dmi.board.name: N150/N210/N220 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.:bvr08JI.M073.20100325.JIP:bd03/25/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnN150/N210/N220:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnN150/N210/N220:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A: dmi.product.name: N150/N210/N220 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/1092517 Title: [Samsung N220] Cannot control backlight using the keyboard keys on Ubuntu Server To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1092517/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
