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[Ljiljan Veselinovic <ljiljan.veselinovic@xxxxxxxxx>]

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"

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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.

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