kernel-packages team mailing list archive

[Gunnar Hjalmarsson <1400155@xxxxxxxxxxxxxxxxxx>]

@David,

Thanks for providing the additional info which Christopher asked for,
and for filing bug #1400345 against a more correct - probably the right
;) - package. Just to prevent any misunderstandings: Your reported
observations and suggestions are much appreciated.

However, so far you haven't answered my question why both this bug and
bug #1400147 were initially filed against the ubuntu-docs package (which
is not correct). I asked you about that only because I would honestly
like to know what lead you in that direction.

You are certainly not alone. Quite often I see bugs filed against
ubuntu-docs which have nothing to do with documentation. That makes me
suspect that there is an erroneous link or something somewhere which
should be corrected.

So, if you are able to recall how you did, it would be much appreciated
if you could let me know.

Cheers,

-- 
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/1400155

Title:
  inconsistent backlight brightness behaviour

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This bug refers to a Dell XPS13-9333 running Ubuntu 14.10.

  I discovered a workaround to prevent the screen starting with full
  brightness.

  The reference to the workaround advice is: 
  http://ubuntuhandbook.org/index.php/2014/04/save-screen-brightness-settings-in-ubuntu-14-04/

  There is a folder sys/class/backlight/intel_backlight/ containing a
  number of files such as brightness, actual_brightness and
  max_brightness. When using Fn-F4 & F5 to control the screen backlight,
  the two files: brightness and actual_brightness respond by changing
  there contents to a number which is a proportion of the contents of
  max_brightness (937).

  The workaround was to include the line:

      echo 569 > /sys/class/backlight/intel_backlight/brightness

  at the end of the file: /etc/rc.local using gedit (where 569 is a
  value noted for a typically comfortable level of backlight).

  This works when doing a restart but, when logging back in after
  logging out, the backlight comes on at maximum brightness.

  This particular laptop has a front-facing webcam fitted. Its function can be confirmed by running the Cheese webcam Booth. It would be a vast improvement if the ambient brightness could be sensed by the webcam and used to adjust the backlight brightness. Auto brightness could be selected or not by a tick box in the Brightness & Lock section of System Settings. Similarly, a tick box might also be provided to enable saving of the backlight brightness when shutting down or logging off
  --- 
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  david      2755 F.... pulseaudio
   /dev/snd/controlC1:  david      2755 F.... pulseaudio
  CurrentDesktop: Unity
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20130203-1
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=2ce4d026-79c8-46d8-aa78-9a01276f4ada
  InstallationDate: Installed on 2014-11-08 (29 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50
  MachineType: Dell Inc. XPS13 9333
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=10c98fc6-0c96-44d3-9e0e-ba93d84dffe6 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-25-generic N/A
   linux-backports-modules-3.16.0-25-generic  N/A
   linux-firmware                             1.138
  Tags:  utopic
  Uname: Linux 3.16.0-25-generic x86_64
  UpgradeStatus: Upgraded to utopic on 2014-11-21 (16 days ago)
  UserGroups: adm cdrom dialout dip libvirtd lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/11/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0D13CR
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/11/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0D13CR:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS13 9333
  dmi.sys.vendor: Dell Inc.
  --- 
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  david      2755 F.... pulseaudio
   /dev/snd/controlC1:  david      2755 F.... pulseaudio
  CurrentDesktop: Unity
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20130203-1
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=2ce4d026-79c8-46d8-aa78-9a01276f4ada
  InstallationDate: Installed on 2014-11-08 (29 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50
  MachineType: Dell Inc. XPS13 9333
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=10c98fc6-0c96-44d3-9e0e-ba93d84dffe6 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-25-generic N/A
   linux-backports-modules-3.16.0-25-generic  N/A
   linux-firmware                             1.138
  Tags:  utopic
  Uname: Linux 3.16.0-25-generic x86_64
  UpgradeStatus: Upgraded to utopic on 2014-11-21 (16 days ago)
  UserGroups: adm cdrom dialout dip libvirtd lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/11/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0D13CR
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd09/11/2014:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0D13CR:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS13 9333
  dmi.sys.vendor: Dell Inc.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1400155/+subscriptions