I'm no expert but a working command you can use to change the display
brightness temporarily as a normal user is:
echo somevalue | sudo tee /sys/class/backlight/acpi_video0/brightness
For example if you want to set the brightness to 2, run following:
echo 2 | sudo tee /sys/class/backlight/acpi_video0/brightness
If the command is run as root (like it's done if added to rc.local), you can
just use the echo x > ... command. If this doesn't work during startup, it's
very likely that the case is what Steve Langasek describes in another bug
report:
"And even if you get it to work at the commandline, this setting may be
getting overridden by the desktop after rc.local runs."
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-power-manager in Ubuntu.
https://bugs.launchpad.net/bugs/923940
Title:
Ubuntu 12.04 LTS set max lcd brightness on every boot
Status in “gnome-power-manager” package in Ubuntu:
Confirmed
Bug description:
I'm on:
Linux 3.2.0-12-generic-pae #20-Ubuntu SMP Sat Jan 28 01:10:59 UTC 2012 i686
I solve the issue editing the file
/etc/rc.local
adding this line "echo 4 > /sys/class/backlight/acpi_video0/brightness"
(without quotes)
(i use 4 because is value in the middle, in fact 0 is the lower and 8 is the
higher)
Probably there are a better ways to solve this issue (i hope...)
---
ApportVersion: 1.91-0ubuntu1
Architecture: i386
DistroRelease: Ubuntu 12.04
Package: gnome-power-manager 3.2.1-2 [modified:
usr/bin/gnome-power-statistics]
PackageArchitecture: i386
ProcVersionSignature: Ubuntu 3.2.0-15.24-generic-pae 3.2.5
Tags: precise
Uname: Linux 3.2.0-15-generic-pae i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
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