Cody, the current version of my script works only with one graphical adapter
(its brightness file is named /sys/class/backlight/acpi_video0/brightness).
You can customize this value in my script at row 16
BRIGHTNESS_CONTROL=/sys/class/backlight/acpi_video0/brightness
to path which is *correct* for your hardware.
Correct path may be determined by the following steps:
1. List all paths with brightness file in /sys/class/backlight dir with the
command
ls /sys/class/backlight/*/brightness
example:
/sys/class/backlight/acpi_video0/brightness
/sys/class/backlight/acpi_video1/brightness
2a. Read values of brightness from files with the command:
cat /sys/class/backlight/*/brightness
example:
3
8
2b. Change backlight level with hardware keys (Fn+...) and read again:
cat /sys/class/backlight/*/brightness
example:
4
8
2c. The *correct* path to brightness control file corresponds to the changed
value.
example:
/sys/class/backlight/acpi_video0/brightness # first value changed, so
first file
3. Try to write brightness level manually to *correct* brightness file:
sudo su
echo 3 > /sys/class/backlight/acpi_video0/brightness # example on my
hardware
4. Change BRIGHTNESS_CONTROL variable to the *correct* path in
/etc/init.d/brightness with the command
sudo gedit /etc/init.d/brightness
I'll update my script soon to do all steps automatically.
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Touch seeded packages, which is subscribed to sysvinit in Ubuntu.
https://bugs.launchpad.net/bugs/1270579
Title:
Ubuntu should have an upstart job for saving/restoring backlight level
on laptops
Status in elementary OS:
New
Status in One Hundred Papercuts:
Confirmed
Status in Ubuntu MATE:
Opinion
Status in systemd package in Ubuntu:
Triaged
Status in sysvinit package in Ubuntu:
Invalid
Status in sysvinit package in Debian:
New
Bug description:
I have tested many distros - Arch, OpenSuSe 13.1, Fedora 20, ALT Linux p7,
Sabayon, Mageia 4.
Many of them are based on systemd.
It does not matter what init system they use, but all of them have very
usefull script (or binary program, I don't know) for saving and restoring
backlight level on laptop.
In these distros there is a script for save and restore backlight levels for
two video-cards (acpi_video0 and acpi_video1). During system boot it is
indicated as follows:
"
[ OK ] Started Load/Save Screen Backlight Brightness of acpi_video1.
[ OK ] Started Load/Save Screen Backlight Brightness of acpi_video0.
".
I have a draft version, which works normally on my VAIO F13Z1R laptop with
Ubuntu 12.04.4. It is in attachment.
You can use it unmodified or modify it for compatibility or something. I made
symlinks for it:
ln -s /etc/init.d/brightness /etc/rc0.d/S25backlight
ln -s /etc/init.d/brightness /etc/rcS.d/S25backlight
ln -s /etc/init.d/brightness /etc/rc6.d/S25backlight
For details you can read my comment on askubuntu
(http://askubuntu.com/a/227553/66509).
I think that having a script for saving and restoring backlight level is very
useful for laptop Ubuntu users.
So, please, add such init script to default Ubuntu installation.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: initscripts 2.88dsf-41ubuntu5
ProcVersionSignature: Ubuntu 3.13.0-4.19-generic 3.13.0-rc8
Uname: Linux 3.13.0-4-generic i686
ApportVersion: 2.13.1-0ubuntu1
Architecture: i386
CurrentDesktop: GNOME
Date: Sun Jan 19 17:20:26 2014
InstallationDate: Installed on 2013-10-20 (91 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
SourcePackage: sysvinit
UpgradeStatus: Upgraded to trusty on 2013-11-19 (61 days ago)
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