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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

Hello Anthony,
Yes, it works with 14.10 without this issue (running on opensource nouveau driver, since the nvidia driver is not available yet, see bug 1362098)

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https://bugs.launchpad.net/bugs/1395618

Title:
  [Dell Vostro 20 3015] Unable to control brightness with 14.04.1

Status in HWE Next Project:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  CID: 201402-14810 Dell Vostro 20 3015

  Brightness control does not work on this AIO system
  The brightness level indicator would change with hotkey events, but the brightness itself does not.

  
  Debugging information:
  ubuntu@201402-14810:~$ ls /sys/class/backlight
  acpi_video0  intel_backlight

  ubuntu@201402-14810:~$ grep -r . /proc/acpi
  /proc/acpi/wakeup:Device	S-state	  Status   Sysfs node
  /proc/acpi/wakeup:XHC1	  S4	*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  pci:0000:00:1c.2
  /proc/acpi/wakeup:PXSX	  S4	*disabled  pci:0000:02:00.0
  /proc/acpi/wakeup:RP04	  S4	*disabled  pci:0000:00:1c.3
  /proc/acpi/wakeup:PXSX	  S4	*enabled   pci:0000:03:00.0
  /proc/acpi/wakeup:PWRB	  S4	*enabled 

  ubuntu@201402-14810:~$ dmesg | grep 'ACPI: Video'
  [   15.958744] ACPI: Video Device [PEGP] (multi-head: yes  rom: yes  post: no)
  [   15.960535] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
  ubuntu@201402-14810:~$

  ubuntu@201402-14810:~$ sudo showkey -k
  kb mode was ?UNKNOWN?
  [ if you are trying this under X, it might not work
  since the X server is also reading /dev/console ]

  press any key (program terminates 10s after last keypress)...
  keycode  28 release
  keycode 225 press
  keycode 225 release
  keycode 225 press
  keycode 225 release
  keycode 224 press
  keycode 224 release
  keycode 224 press
  keycode 224 release
  ^Ccaught signal 2, cleaning up...
  ubuntu@201402-14810:~$ 

  Keycode and scan code with brightness up / down key
  ubuntu@201402-14810:~$ sudo showkey -s
  kb mode was ?UNKNOWN?
  [ if you are trying this under X, it might not work
  since the X server is also reading /dev/console ]

  press any key (program terminates 10s after last keypress)...
  0x9c 
  0xe0 0x54 0xe0 0xd4 0xe0 0x54 0xe0 0xd4 
  0xe0 0x4c 0xe0 0xcc 0xe0 0x4c 0xe0 0xcc 
  0x1d 
  ^Ccaught signal 2, cleaning up...
  ubuntu@201402-14810:~$

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-39-generic 3.13.0-39.66
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
  Uname: Linux 3.13.0-39-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1597 F.... pulseaudio
  CRDA:
   country TW:
   	(2402 - 2472 @ 40), (3, 27)
   	(5270 - 5330 @ 40), (3, 17), DFS
   	(5735 - 5815 @ 40), (3, 30)
  CurrentDesktop: Unity
  Date: Mon Nov 24 02:41:31 2014
  HibernationDevice: RESUME=UUID=944a1d0f-5400-4d20-a9f3-8b43d4ae02a1
  InstallationDate: Installed on 2014-11-19 (4 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Vostro 20 3015
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=c241f0c7-88e6-435b-901f-35b094219306 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-39-generic N/A
   linux-backports-modules-3.13.0-39-generic  N/A
   linux-firmware                             1.127.8
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 02/18/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: X13
  dmi.board.name: Type2 - Board Product Name1
  dmi.board.vendor: Dell Inc.
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 13
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: X13
  dmi.modalias: dmi:bvnDellInc.:bvrX13:bd02/18/2014:svnDellInc.:pnVostro203015:pvr:rvnDellInc.:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnDellInc.:ct13:cvrX13:
  dmi.product.name: Vostro 20 3015
  dmi.sys.vendor: Dell Inc.

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