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Message #150120
[Bug 1516320] Re: [Samsung NP530U4E-K02PL] Cannot change backlight
Reported at kernel linux-acpi list with a bug report
https://bugzilla.kernel.org/show_bug.cgi?id=108971
** Bug watch added: Linux Kernel Bug Tracker #108971
http://bugzilla.kernel.org/show_bug.cgi?id=108971
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https://bugs.launchpad.net/bugs/1516320
Title:
[Samsung NP530U4E-K02PL] Cannot change backlight
Status in linux package in Ubuntu:
Triaged
Bug description:
Option stopped working after upgrading to 15.10, full light all time
(before with some hacking it was working, but still was lacking
keeping the levels between reboots).
WORKAROUND: Add kernel parameter:
acpi_osi=
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-18-generic 4.2.0-18.22
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ab 2051 F.... pulseaudio
CurrentDesktop: KDE
Date: Sat Nov 14 22:44:57 2015
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=33abcad5-3750-4855-b97b-2d5b0fb864ee
InstallationDate: Installed on 2013-10-24 (751 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U4E/540U4E
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=f467e962-e87d-4a39-a861-79138b4809d1 ro quiet splash resume=/dev/sdb2 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.2.0-18-generic N/A
linux-backports-modules-4.2.0-18-generic N/A
linux-firmware 1.149.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/05/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P07ACM.063.130905.dg
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP530U4E-K02PL
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: SEC_SW_REVISION_1234567890ABCD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP07ACM.063.130905.dg:bd09/05/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U4E/540U4E:pvrP07ACM:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP530U4E-K02PL:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 530U4E/540U4E
dmi.product.version: P07ACM
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
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References