poetzmij, this bug was reported a while ago and there hasn't been any
activity in it recently. We were wondering if this is still an issue? If
so, could you please test for this with the latest development release
of Ubuntu? ISO CD images are available from
http://www.ubuntu.com/download/desktop .

If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following 
https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional 
upstream developers to examine the issue. Please do not test the kernel in the 
daily folder, but the one all the way at the bottom. Once you've tested the 
upstream kernel, please comment on which kernel version specifically you tested 
and remove the tag:
needs-upstream-testing

This can be done by clicking on the yellow pencil icon next to the tag located 
at the bottom of the bug description and deleting the text:
needs-upstream-testing

If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested.

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

If you are unable to test the mainline kernel, please comment as to why 
specifically you were unable to test it and add the following tags:
kernel-unable-to-test-upstream
kernel-unable-to-test-upstream-VERSION-NUMBER

Please let us know your results. Thank you for your understanding.

** Description changed:

  When changing the brightness on my Dell XPS 14" some incremental states
  of brightness are broken(leave the screen brightness completely off, and
  i cant see at all) on mine there are 16 states, the first 9 work then
  10,11,12,13 are broken 14 works , and 15,16 are broken. (these numbers
  are going from max brightness going down so 1=max brightness)
  
  This is extremely inconvenient for me, I cannot set the screen to dim in
  power savings because of this, and even worse in 11.10 because so far i
  don't see an option to turn that off at all in settings.
  
  I am using the Nvidia binaries if that is important.
- --- 
+ ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: Intel [HDA Intel], device 0: ALC665 Analog [ALC665 Analog]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
+  **** List of CAPTURE Hardware Devices ****
+  card 0: Intel [HDA Intel], device 0: ALC665 Analog [ALC665 Analog]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  michael    1889 F.... pulseaudio
-  /dev/snd/controlC0:  michael    1889 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  michael    1889 F.... pulseaudio
+  /dev/snd/controlC0:  michael    1889 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xfbd00000 irq 49'
-    Mixer name : 'Realtek ALC665'
-    Components : 'HDA:10ec0665,10280468,00100003'
-    Controls      : 23
-    Simple ctrls  : 12
+  Card hw:0 'Intel'/'HDA Intel at 0xfbd00000 irq 49'
+    Mixer name : 'Realtek ALC665'
+    Components : 'HDA:10ec0665,10280468,00100003'
+    Controls      : 23
+    Simple ctrls  : 12
  Card1.Amixer.info:
-  Card hw:1 'NVidia'/'HDA NVidia at 0xfb080000 irq 17'
-    Mixer name : 'Nvidia GPU 14 HDMI/DP'
-    Components : 'HDA:10de0014,10de0101,00100100'
-    Controls      : 16
-    Simple ctrls  : 4
+  Card hw:1 'NVidia'/'HDA NVidia at 0xfb080000 irq 17'
+    Mixer name : 'Nvidia GPU 14 HDMI/DP'
+    Components : 'HDA:10de0014,10de0101,00100100'
+    Controls      : 16
+    Simple ctrls  : 4
  DistroRelease: Ubuntu 11.10
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: Dell Inc. XPS L401X
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcEnviron:
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-16-generic 
root=UUID=90D49D6FD49D5874 loop=/hostname/disks/root.disk ro quiet splash 
vt.handoff=7
  ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
  RelatedPackageVersions:
-  linux-restricted-modules-3.0.0-16-generic N/A
-  linux-backports-modules-3.0.0-16-generic  N/A
-  linux-firmware                            1.60.1
+  linux-restricted-modules-3.0.0-16-generic N/A
+  linux-backports-modules-3.0.0-16-generic  N/A
+  linux-firmware                            1.60.1
  StagingDrivers: mei
  Tags:  oneiric running-unity staging
  Uname: Linux 3.0.0-16-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 12/22/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 0KXFG0
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd12/22/2010:svnDellInc.:pnXPSL401X:pvrNotSpecified:rvnDellInc.:rn0KXFG0:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS L401X
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.
- --- 
- AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
- ApportVersion: 1.23-0ubuntu4
- Architecture: amd64
- ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: Intel [HDA Intel], device 0: ALC665 Analog [ALC665 Analog]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
- AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  michael    1889 F.... pulseaudio
-  /dev/snd/controlC0:  michael    1889 F.... pulseaudio
- CRDA: Error: [Errno 2] No such file or directory
- Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xfbd00000 irq 49'
-    Mixer name : 'Realtek ALC665'
-    Components : 'HDA:10ec0665,10280468,00100003'
-    Controls      : 23
-    Simple ctrls  : 12
- Card1.Amixer.info:
-  Card hw:1 'NVidia'/'HDA NVidia at 0xfb080000 irq 17'
-    Mixer name : 'Nvidia GPU 14 HDMI/DP'
-    Components : 'HDA:10de0014,10de0101,00100100'
-    Controls      : 16
-    Simple ctrls  : 4
- DistroRelease: Ubuntu 11.10
- InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
- MachineType: Dell Inc. XPS L401X
- NonfreeKernelModules: nvidia
- Package: linux (not installed)
- ProcEnviron:
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
- ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-16-generic 
root=UUID=90D49D6FD49D5874 loop=/hostname/disks/root.disk ro quiet splash 
vt.handoff=7
- ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
- RelatedPackageVersions:
-  linux-restricted-modules-3.0.0-16-generic N/A
-  linux-backports-modules-3.0.0-16-generic  N/A
-  linux-firmware                            1.60.1
- StagingDrivers: mei
- Tags:  oneiric running-unity staging
- Uname: Linux 3.0.0-16-generic x86_64
- UpgradeStatus: No upgrade log present (probably fresh install)
- UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
- dmi.bios.date: 12/22/2010
- dmi.bios.vendor: Dell Inc.
- dmi.bios.version: A06
- dmi.board.name: 0KXFG0
- dmi.board.vendor: Dell Inc.
- dmi.board.version: A00
- dmi.chassis.type: 8
- dmi.chassis.vendor: Dell Inc.
- dmi.chassis.version: Not Specified
- dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd12/22/2010:svnDellInc.:pnXPSL401X:pvrNotSpecified:rvnDellInc.:rn0KXFG0:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
- dmi.product.name: XPS L401X
- dmi.product.version: Not Specified
- dmi.sys.vendor: Dell Inc.

** Attachment removed: "AlsaDevices.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732607/+files/AlsaDevices.txt

** Attachment removed: "AplayDevices.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732608/+files/AplayDevices.txt

** Attachment removed: "AcpiTables.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732606/+files/AcpiTables.txt

** Attachment removed: "BootDmesg.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732609/+files/BootDmesg.txt

** Attachment removed: "Card0.Amixer.values.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732610/+files/Card0.Amixer.values.txt

** Attachment removed: "Card1.Amixer.values.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732612/+files/Card1.Amixer.values.txt

** Attachment removed: "Card0.Codecs.codec.0.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732611/+files/Card0.Codecs.codec.0.txt

** Attachment removed: "Card1.Codecs.codec.0.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732613/+files/Card1.Codecs.codec.0.txt

** Attachment removed: "Card1.Codecs.codec.1.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732614/+files/Card1.Codecs.codec.1.txt

** Attachment removed: "Card1.Codecs.codec.2.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732615/+files/Card1.Codecs.codec.2.txt

** Attachment removed: "Card1.Codecs.codec.3.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732616/+files/Card1.Codecs.codec.3.txt

** Attachment removed: "CurrentDmesg.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/858518/+attachment/2732617/+files/CurrentDmesg.txt

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/858518

Title:
  Changing display brightness is buggy on Dell L401X XPS 14"

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