** Changed in: linux (Ubuntu) Assignee: Anthony Wong (anthonywong) => Liming Wang (wangliming)
-- 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/1341988 Title: [Dell Inspiron 11 - 3147] Brightness control does not work on this system Status in “linux” package in Ubuntu: Confirmed Bug description: CID: 201403-14888 Dell Inspiron 11 - 3147 The screen brightness cannot be controlled by the hotkey. Steps: 1. Install 14.04 + update (3.13.0-30), boot to desktop 2. Try to control brightness with the hotkey 3. Try to control brightness with "Brightness and Lock" applet Expected result: * Brightness could be controlled by the hotkey or the applet Actual result: * Brightness level indicator changed along with the hotkey, but the brightness won't be changed at all. Debugging information: ubuntu@201403-14888:~$ grep -r . /proc/acpi /proc/acpi/button/lid/LID0/state:state: open /proc/acpi/wakeup:Device S-state Status Sysfs node /proc/acpi/wakeup:XHC1 S0 *enabled pci:0000:00:14.0 /proc/acpi/wakeup:RP01 S4 *disabled pci:0000:00:1c.0 /proc/acpi/wakeup:PXSX S4 *disabled /proc/acpi/wakeup:RP02 S4 *disabled /proc/acpi/wakeup:PXSX S4 *disabled /proc/acpi/wakeup:RP03 S4 *disabled /proc/acpi/wakeup:PXSX S4 *disabled /proc/acpi/wakeup:RP04 S4 *disabled /proc/acpi/wakeup:PXSX S4 *disabled /proc/acpi/wakeup:PWRB S4 *enabled /proc/acpi/wakeup:LID0 S3 *enabled ubuntu@201403-14888:~$ ls /sys/class/backlight/ acpi_video0 intel_backlight ubuntu@201403-14888:~$ dmesg | grep 'ACPI: Video' [ 10.409549] ACPI: Video Device [PEGP] (multi-head: yes rom: no post: no) [ 10.435109] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no) ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-30-generic 3.13.0-30.55 ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2 Uname: Linux 3.13.0-30-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 1563 F.... pulseaudio CRDA: country TW: (2402 - 2472 @ 40), (3, 27) (5270 - 5330 @ 40), (3, 17), DFS (5735 - 5815 @ 40), (3, 30) CurrentDesktop: Unity Date: Tue Jul 15 02:04:08 2014 HibernationDevice: RESUME=UUID=b30f45e9-6fc7-4aa0-adff-37e7c87c19cd InstallationDate: Installed on 2014-07-15 (0 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: Dell Inc. Inspiron 11 - 3147 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic.efi.signed root=UUID=cc246aa9-85c1-49ac-b06b-6c0f4e37dbea ro quiet splash RelatedPackageVersions: linux-restricted-modules-3.13.0-30-generic N/A linux-backports-modules-3.13.0-30-generic N/A linux-firmware 1.127.4 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/05/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A01 dmi.board.name: 00K010 dmi.board.vendor: Dell Inc. dmi.board.version: D02 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A01 dmi.modalias: dmi:bvnDellInc.:bvrA01:bd05/05/2014:svnDellInc.:pnInspiron11-3147:pvr:rvnDellInc.:rn00K010:rvrD02:cvnDellInc.:ct8:cvrA01: dmi.product.name: Inspiron 11 - 3147 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1341988/+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