[Kernel-packages] [Bug 1537324] Re: No brightness control on Samsung NP530U4E-K01RU
** Tags removed: kernel-bug-exists-upstream ** Tags added: cherry-pick kernel-fixed-upstream ** Changed in: linux (Ubuntu) Status: Confirmed => Triaged -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1537324 Title: No brightness control on Samsung NP530U4E-K01RU Status in linux package in Ubuntu: Triaged Bug description: Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU 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 and /sys/class/backlight/intel_backlight/actual_brightness changes, but actual screen brightness is the same: $ grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:2792 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:2792 grep: /sys/class/backlight/intel_backlight/device: Is a directory /sys/class/backlight/intel_backlight/max_brightness:4648 grep: /sys/class/backlight/intel_backlight/power: Is a directory grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory /sys/class/backlight/intel_backlight/type:raw All the logs are in the attached archive backlight_bug_report.tar.gz 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-firmware1.149.3 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1537324/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1537324] Re: No brightness control on Samsung NP530U4E-K01RU
Testing with 4.5-rc1 results: /sys/class/backlight/acpi_video0/ appeared. Brightness changes if i echo the value to /sys/class/backlight/acpi_video0/brightness Tracked it down to this kernel.org bug report: https://bugzilla.kernel.org/show_bug.cgi?id=108971 It seems to be exactly the same issue. For now I added kernel parameter acpi_backlight=video to grub config and changed backlight control interface in xorg.conf to acpi_video0. Works fine. ** Bug watch added: Linux Kernel Bug Tracker #108971 http://bugzilla.kernel.org/show_bug.cgi?id=108971 ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1537324 Title: No brightness control on Samsung NP530U4E-K01RU Status in linux package in Ubuntu: Confirmed Bug description: Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU 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 and /sys/class/backlight/intel_backlight/actual_brightness changes, but actual screen brightness is the same: $ grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:2792 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:2792 grep: /sys/class/backlight/intel_backlight/device: Is a directory /sys/class/backlight/intel_backlight/max_brightness:4648 grep: /sys/class/backlight/intel_backlight/power: Is a directory grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory /sys/class/backlight/intel_backlight/type:raw All the logs are in the attached archive backlight_bug_report.tar.gz 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-firmware1.149.3 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1537324/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1537324] Re: No brightness control on Samsung NP530U4E-K01RU
Andrey Makeev, the latest mainline kernel (4.5-rc1) was released two days ago. Could you please test this and advise to the results? ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1537324 Title: No brightness control on Samsung NP530U4E-K01RU Status in linux package in Ubuntu: Incomplete Bug description: Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU 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 and /sys/class/backlight/intel_backlight/actual_brightness changes, but actual screen brightness is the same: $ grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:2792 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:2792 grep: /sys/class/backlight/intel_backlight/device: Is a directory /sys/class/backlight/intel_backlight/max_brightness:4648 grep: /sys/class/backlight/intel_backlight/power: Is a directory grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory /sys/class/backlight/intel_backlight/type:raw All the logs are in the attached archive backlight_bug_report.tar.gz 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-firmware1.149.3 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1537324/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1537324] Re: No brightness control on Samsung NP530U4E-K01RU
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.4 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1537324 Title: No brightness control on Samsung NP530U4E-K01RU Status in linux package in Ubuntu: Incomplete Bug description: Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU 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 and /sys/class/backlight/intel_backlight/actual_brightness changes, but actual screen brightness is the same: $ grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:2792 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:2792 grep: /sys/class/backlight/intel_backlight/device: Is a directory /sys/class/backlight/intel_backlight/max_brightness:4648 grep: /sys/class/backlight/intel_backlight/power: Is a directory grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory /sys/class/backlight/intel_backlight/type:raw All the logs are in the attached archive backlight_bug_report.tar.gz 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-firmware1.149.3 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1537324/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1537324] Re: No brightness control on Samsung NP530U4E-K01RU
I've tested it on v4.4-wily and v4.4-rc8-wily. Same problem: /sys/class/backlight/intel_backlight/brightness changes, but the actual screen brightness doesn't. ** Tags added: kernel-bug-exists-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1537324 Title: No brightness control on Samsung NP530U4E-K01RU Status in linux package in Ubuntu: Confirmed Bug description: Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU 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 and /sys/class/backlight/intel_backlight/actual_brightness changes, but actual screen brightness is the same: $ grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:2792 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:2792 grep: /sys/class/backlight/intel_backlight/device: Is a directory /sys/class/backlight/intel_backlight/max_brightness:4648 grep: /sys/class/backlight/intel_backlight/power: Is a directory grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory /sys/class/backlight/intel_backlight/type:raw All the logs are in the attached archive backlight_bug_report.tar.gz 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-firmware1.149.3 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1537324/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1537324] Re: No brightness control on Samsung NP530U4E-K01RU
** Summary changed: - No brightness control on Samsung NP530U4E-K10RU + No brightness control on Samsung NP530U4E-K01RU ** Description changed: Backlight control does not work, but there are entries in /sys/class/backlight. - Laptop model is: NP530U4E-K10RU + Laptop model: NP530U4E-K01RU 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-firmware1.149.3 + linux-restricted-modules-4.2.0-25-generic N/A + linux-backports-modules-4.2.0-25-generic N/A + linux-firmware1.149.3 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. ** Description changed: Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU 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. + All the logs are in the attached archive backlight_bug_report.tar.gz 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-firmware1.149.3 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
[Kernel-packages] [Bug 1537324] Re: No brightness control on Samsung NP530U4E-K01RU
** Description changed: Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU 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. + /sys/class/backlight/intel_backlight/brightness and + /sys/class/backlight/intel_backlight/actual_brightness changes, but + actual screen brightness is the same: + + $ grep . /sys/class/backlight/intel_backlight/* + /sys/class/backlight/intel_backlight/actual_brightness:2792 + /sys/class/backlight/intel_backlight/bl_power:0 + /sys/class/backlight/intel_backlight/brightness:2792 + grep: /sys/class/backlight/intel_backlight/device: Is a directory + /sys/class/backlight/intel_backlight/max_brightness:4648 + grep: /sys/class/backlight/intel_backlight/power: Is a directory + grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory + /sys/class/backlight/intel_backlight/type:raw All the logs are in the attached archive backlight_bug_report.tar.gz 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-firmware1.149.3 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. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1537324 Title: No brightness control on Samsung NP530U4E-K01RU Status in linux package in Ubuntu: Confirmed Bug description: Backlight control does not work, but there are entries in /sys/class/backlight. Laptop model: NP530U4E-K01RU 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 and /sys/class/backlight/intel_backlight/actual_brightness changes, but actual screen brightness is the same: $ grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:2792 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:2792 grep: /sys/class/backlight/intel_backlight/device: Is a directory /sys/class/backlight/intel_backlight/max_brightness:4648 grep: /sys/class/backlight/intel_backlight/power: Is a directory grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory /sys/class/backlight/intel_backlight/type:raw All the logs are in the attached archive backlight_bug_report.tar.gz 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
