Tried following kernel parameters, 1. acpi_osi="!Windows 2012" 2. acpi_backlight=vendor 3. video.use_native_backlight=1 each of them can fix this bug.
Since upstream is going to change the default for video.use_native_backlight to 1, this bug can be fixed in later release after the patch is merged. ref: https://www.mail-archive.com/linux- ker...@vger.kernel.org/msg658581.html ** Changed in: linux (Ubuntu Trusty) 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/1250401 Title: [Dell Inspiron 5737] brightness could not be controlled by the indicator applet "System settings -> Brightness and Lock"" but sysfs works Status in “linux” package in Ubuntu: Confirmed Status in “linux-lts-raring” package in Ubuntu: New Status in “linux” source package in Trusty: Triaged Status in “linux-lts-raring” source package in Trusty: Invalid Bug description: Dell Inspiron 5737 (CID 201305-13636) with ubuntu 12.04.3 steps to reproduce the bug: 1. install 12.04.3 on this machine 2. update the system via update manager to make the system up-to-date 3. click the upper-right indicator to launch the "System settings -> Brightness and Lock" applet 4. try to adjust the brightness bar to control the brightness expected result: the brightness could be adjusted by the bar actual result: screen brightness has no response -------------------------------------- ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.8.0-33-generic 3.8.0-33.48~precise1 ProcVersionSignature: Ubuntu 3.8.0-33.48~precise1-generic 3.8.13.11 Uname: Linux 3.8.0-33-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-33-generic. ApportVersion: 2.0.1-0ubuntu17.6 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 1: PCH [HDA Intel PCH], device 0: ALC283 Analog [ALC283 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: ubuntu 1708 F.... pulseaudio /dev/snd/controlC0: ubuntu 1708 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'MID'/'HDA Intel MID at 0x90710000 irq 62' Mixer name : 'Intel Haswell HDMI' Components : 'HDA:80862807,80860101,00100000' Controls : 21 Simple ctrls : 3 Card1.Amixer.info: Card hw:1 'PCH'/'HDA Intel PCH at 0x90714000 irq 63' Mixer name : 'Realtek ALC283' Components : 'HDA:10ec0283,102805ec,00100002' Controls : 16 Simple ctrls : 7 Date: Tue Nov 12 05:49:09 2013 HibernationDevice: RESUME=UUID=d809501f-7daa-47a2-8299-1844cd4d75cc InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1) MachineType: Dell Inc. Inspiron 5737 MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-33-generic root=UUID=fdac94e0-b7ee-402a-a160-6567b65501c6 ro quiet splash initcall_debug vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-33-generic N/A linux-backports-modules-3.8.0-33-generic N/A linux-firmware 1.79.7 SourcePackage: linux-lts-raring StagingDrivers: rts5139 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/30/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 04X8RP dmi.board.vendor: Dell Inc. dmi.board.version: X01 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A05 dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/30/2013:svnDellInc.:pnInspiron5737:pvrA05:rvnDellInc.:rn04X8RP:rvrX01:cvnDellInc.:ct8:cvrA05: dmi.product.name: Inspiron 5737 dmi.product.version: A05 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1250401/+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
