[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1092517
Title:
[Samsung N220] Cannot control backlight using the keyboard keys on
Ubuntu Server
Status in “linux” package in Ubuntu:
Expired
Bug description:
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 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.
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.
WORKAROUND: With the following kernel parameter the Fn keys function
correctly:
acpi=off
---
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
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
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.
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