[Bug 589937] [NEW] Backlight control doesn't work in Samsung x520

[Zygmunt Krynicki]

Public bug reported:

Backlight controls on Samsung laptos are a little strange and each new laptop seems to have the same set of problems:
1) Pressing FN+UP/ FN+DOWN (backlight +/-) does not produce key release events thus hanging the keyboard in X
    (this problem is now fixable in userspace by writing to /sys/devices/platform/i8042/serio0/force_release
2) Backlight control doesn't do anything (even if the keys are recognized)

Similar bugs exist for most popular Samsung laptops

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.34-5-generic 2.6.34-5.13
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.34-5.13-generic 2.6.34
Uname: Linux 2.6.34-5-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.22.1.
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
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfa700000 irq 29'
   Mixer name	: 'Intel G45 DEVCTG'
   Components	: 'HDA:10ec0269,144dc060,00100004 HDA:80862802,80860101,00100000'
   Controls      : 17
   Simple ctrls  : 9
Date: Sat Jun  5 01:08:47 2010
HibernationDevice: RESUME=UUID=480a6176-9214-4fc5-897f-940bbbe8c710
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
MachineType: SAMSUNG ELECTRONICS CO., LTD. X320/X420/X520
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.34-5-generic root=UUID=26980be5-8cc6-4acb-bbb1-d282047265e5 ro quiet splash acpi_backlight=vendor
ProcEnviron:
 LANG=pl_PL.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.35
RfKill:
 0: phy0: Wireless LAN
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux
WifiSyslog:
 Jun  5 00:53:27 x520 NetworkManager: <info>  (wlan0): supplicant connection state:  completed -> group handshake
 Jun  5 00:53:27 x520 NetworkManager: <info>  (wlan0): supplicant connection state:  group handshake -> completed
dmi.bios.date: 04/12/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 09IA.M011.20100412.KSY
dmi.board.name: X320/X420/X520
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.:bvr09IA.M011.20100412.KSY:bd04/12/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnX320/X420/X520:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnX320/X420/X520:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
dmi.product.name: X320/X420/X520
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug backlight graphics maverick needs-upstream-testing samsung

-- 
Backlight control doesn't work in Samsung x520
https://bugs.launchpad.net/bugs/589937
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