I am using Dell Latitude 3540 and Ubuntu 14.10. Brightness works just fine (with hotkeys and in settings). However, the brightness level is not saved when restaring computer so next time computer starts the brightness level is at 100%. Should I report this as a new bug?
I managed to control this by changing /etc/rc.local with command "echo 600 > /sys/class/backlight/intel_backlight/brightness" -- 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/1348020 Title: [Dell Latitude 3540] Unable to control brightness Status in linux package in Ubuntu: Fix Released Status in linux source package in Trusty: Won't Fix Status in linux source package in Utopic: Fix Released Bug description: CIDL 201306-13866 Dell Latitude 3540 The brightness control does not work on this system Steps: 1. Install 14.04 + update (3.13.0-32), boot to desktop 2. Try to change the brightness by using the hotkeys 3. Try to change the brightness by using the "Brightness and Lock" applet Expect result: * Brightness control works fine Actual result: * Brightness level indicator changes with the hotkey, but not the brightness. * Brightness cannot be changed by the applet Debugging information: ubuntu@201306-13866:~$ ls /sys/class/backlight acpi_video0 intel_backlight ubuntu@201306-13866:~$ grep -r . /proc/acpi /proc/acpi/battery/BAT1/alarm:alarm: unsupported /proc/acpi/battery/BAT1/state:present: yes /proc/acpi/battery/BAT1/state:capacity state: ok /proc/acpi/battery/BAT1/state:charging state: charged /proc/acpi/battery/BAT1/state:present rate: 1 mA /proc/acpi/battery/BAT1/state:remaining capacity: 5900 mAh /proc/acpi/battery/BAT1/state:present voltage: 12972 mV /proc/acpi/battery/BAT1/info:present: yes /proc/acpi/battery/BAT1/info:design capacity: 5900 mAh /proc/acpi/battery/BAT1/info:last full capacity: 5900 mAh /proc/acpi/battery/BAT1/info:battery technology: rechargeable /proc/acpi/battery/BAT1/info:design voltage: 11100 mV /proc/acpi/battery/BAT1/info:design capacity warning: 590 mAh /proc/acpi/battery/BAT1/info:design capacity low: 177 mAh /proc/acpi/battery/BAT1/info:cycle count: 0 /proc/acpi/battery/BAT1/info:capacity granularity 1: 264 mAh /proc/acpi/battery/BAT1/info:capacity granularity 2: 3780 mAh /proc/acpi/battery/BAT1/info:model number: DELL G019Y35H /proc/acpi/battery/BAT1/info:serial number: 0C45 /proc/acpi/battery/BAT1/info:battery type: Li-Ion /proc/acpi/battery/BAT1/info:OEM info: SDI /proc/acpi/button/lid/LID0/state:state: open /proc/acpi/wakeup:Device S-state Status Sysfs node /proc/acpi/wakeup:P0P1 S4 *disabled /proc/acpi/wakeup:LID0 S3 *enabled /proc/acpi/wakeup:EHC1 S0 *enabled pci:0000:00:1d.0 /proc/acpi/wakeup:XHC S0 *enabled pci:0000:00:14.0 /proc/acpi/wakeup:PXSX S4 *disabled /proc/acpi/wakeup:RP03 S3 *disabled pci:0000:00:1c.0 /proc/acpi/wakeup:PEG0 S4 *disabled /proc/acpi/wakeup:PEGP S4 *disabled /proc/acpi/wakeup:PEG1 S4 *disabled /proc/acpi/wakeup:PEG2 S4 *disabled ubuntu@201306-13866:~$ dmesg | grep 'ACPI: Video' [ 11.036337] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no) ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-32-generic 3.13.0-32.57 ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4 Uname: Linux 3.13.0-32-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 1586 F.... pulseaudio CRDA: country TW: (2402 - 2472 @ 40), (3, 27) (5270 - 5330 @ 40), (3, 17), DFS (5735 - 5815 @ 40), (3, 30) CurrentDesktop: Unity Date: Wed Jul 23 23:35:09 2014 HibernationDevice: RESUME=UUID=bce2a764-eac9-4044-b879-caa497463b91 InstallationDate: Installed on 2014-07-24 (0 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: Dell Inc. Latitude 3540 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed root=UUID=1dd2f74b-d1f1-42e1-9c35-6675a578b71e ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.13.0-32-generic N/A linux-backports-modules-3.13.0-32-generic N/A linux-firmware 1.127.5 SourcePackage: linux StagingDrivers: rts5139 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/06/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A01 dmi.board.name: 0992HC dmi.board.vendor: Dell Inc. dmi.board.version: X01 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A01 dmi.modalias: dmi:bvnDellInc.:bvrA01:bd08/06/2013:svnDellInc.:pnLatitude3540:pvrA01:rvnDellInc.:rn0992HC:rvrX01:cvnDellInc.:ct8:cvrA01: dmi.product.name: Latitude 3540 dmi.product.version: A01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1348020/+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
