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Message #157509
[Bug 1537324] [NEW] No brightness control on Samsung NP530U4E-K10RU
Public bug reported:
Backlight control does not work, but there are entries in
/sys/class/backlight.
Laptop model is: NP530U4E-K10RU
Video adapter: Intel HD graphics 4000
I've tried all the suggestions from
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
kernel parameters acpi_backlight=vendor,
video.use_bios_initial_backlight=0, video.use_native_backlight=1 didn't
work.
In this laptop brightness is controlled by Fn + F2 and Fn+F3. Whenever i
try to change brightness, the value in
/sys/class/backlight/intel_backlight/brightness changes, but actual
screen brightness is the same.
All the logs are in the attached archive.
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-25-generic 4.2.0-25.30
ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
Uname: Linux 4.2.0-25-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Jan 23 09:55:32 2016
HibernationDevice: RESUME=UUID=9d4a6619-c5f9-46c2-b11b-e230e9d357e3
InstallationDate: Installed on 2014-05-20 (613 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U4E/540U4E
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-25-generic root=UUID=686fa320-83d1-4015-a632-bb2a91390ab6 ro quiet splash video.use_bios_initial_backlight=0 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.2.0-25-generic N/A
linux-backports-modules-4.2.0-25-generic N/A
linux-firmware 1.149.3
SourcePackage: linux
UpgradeStatus: Upgraded to wily on 2015-11-25 (58 days ago)
dmi.bios.date: 02/26/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P08ACM.065.140226.dg
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP530U4E-K01RU
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.:bvrP08ACM.065.140226.dg:bd02/26/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U4E/540U4E:pvrP08ACM:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP530U4E-K01RU:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 530U4E/540U4E
dmi.product.version: P08ACM
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug wily
** Attachment added: "backlight_bug_report.tar.gz"
https://bugs.launchpad.net/bugs/1537324/+attachment/4555228/+files/backlight_bug_report.tar.gz
--
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https://bugs.launchpad.net/bugs/1537324
Title:
No brightness control on Samsung NP530U4E-K10RU
Status in linux package in Ubuntu:
New
Bug description:
Backlight control does not work, but there are entries in
/sys/class/backlight.
Laptop model is: NP530U4E-K10RU
Video adapter: Intel HD graphics 4000
I've tried all the suggestions from
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
kernel parameters acpi_backlight=vendor,
video.use_bios_initial_backlight=0, video.use_native_backlight=1
didn't work.
In this laptop brightness is controlled by Fn + F2 and Fn+F3. Whenever
i try to change brightness, the value in
/sys/class/backlight/intel_backlight/brightness changes, but actual
screen brightness is the same.
All the logs are in the attached archive.
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-25-generic 4.2.0-25.30
ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
Uname: Linux 4.2.0-25-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Jan 23 09:55:32 2016
HibernationDevice: RESUME=UUID=9d4a6619-c5f9-46c2-b11b-e230e9d357e3
InstallationDate: Installed on 2014-05-20 (613 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U4E/540U4E
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-25-generic root=UUID=686fa320-83d1-4015-a632-bb2a91390ab6 ro quiet splash video.use_bios_initial_backlight=0 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.2.0-25-generic N/A
linux-backports-modules-4.2.0-25-generic N/A
linux-firmware 1.149.3
SourcePackage: linux
UpgradeStatus: Upgraded to wily on 2015-11-25 (58 days ago)
dmi.bios.date: 02/26/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P08ACM.065.140226.dg
dmi.board.asset.tag: No Asset Tag
dmi.board.name: NP530U4E-K01RU
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.:bvrP08ACM.065.140226.dg:bd02/26/2014:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U4E/540U4E:pvrP08ACM:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP530U4E-K01RU:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: 530U4E/540U4E
dmi.product.version: P08ACM
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
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