[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1400155
Title:
inconsistent backlight brightness behaviour
Status in linux package in Ubuntu:
Expired
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
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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.
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