== SRU Justification ==
Impact: The standard ACPI backlight interfaces on this machine fail to change the screen brightness. There is an alternate interface supported by the samsung-laptop module that does work, but since userspace prefers acpi_video the hotkeys and UI for adjusting screen brightness fail to work.
Fix: This problem is common enough on Samsung machines that samsung-laptop contains a dmi list of machines which need the acpi_video backlight disabled. Add this machine to that list.
Test Case: Using a driver with the quirk added results in working backlight controls. Tested on LP#1086921.
---
Hello, dear developers of Ubuntu! I want to ask something, that I think is relevant to the Ubuntu:
I have a small samsung netbook that requires a custom kernel module to be installed from a ppa (https://launchpad.net/~voria/+archive/ppa) so that fn keys work for backlight brightness adjustment. My question is: can this kernel module and script be installed in the main kernel, so that this annoyance can be avoided? From what I read this is an issue that has plagued samsung laptop owners for several years now. The installed samsung-tools and samsung-backlight fixes this issue.
I am willing to help if I can, I just want to have a truly out-of-the-box experience with Gnu/Linux. This problem is present in all distros (that's what I read from the Internet, I have only tried it on *buntu).
Thank you in advance.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image (not installed)
ProcVersionSignature: Ubuntu 3.2.0-34.53-generic 3.2.33
Uname: Linux 3.2.0-34-generic i686
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
ApportVersion: 2.0.1-0ubuntu15
Architecture: i386
ArecordDevices:
**** 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: martin 1564 F.... xfce4-volumed
martin 1571 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 47'
Mixer name : 'Realtek ALC269'
Components : 'HDA:10ec0269,144dc08f,00100004'
Controls : 18
Simple ctrls : 10
Date: Wed Dec 5 20:07:50 2012
HibernationDevice: RESUME=UUID=1144cf36-8c2f-4124-943f-4684e409a192
InstallationMedia: Xubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
MachineType: SAMSUNG ELECTRONICS CO., LTD. N250P
MarkForUpload: True
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-34-generic root=UUID=0379bcf6-d023-4729-b527-0d75ccfbe3e0 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-34-generic N/A
linux-backports-modules-3.2.0-34-generic N/A
linux-firmware 1.79.1
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/09/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 01HG.M011.20101209.RHU
dmi.board.asset.tag: SAMSUNG
dmi.board.name: N250P
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.:bvr01HG.M011.20101209.RHU:bd12/09/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnN250P:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnN250P:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
dmi.product.name: N250P
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
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