Public bug reported:
I am using Version 12.10 and Samsung 300V5A laptop.
The brightness could not be changed until I modify grub setting from
/etc/default/grub and modifying the line as follows:
"GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux
acpi_backlight=vendor"
Now it works, but when I need to logout and login again, it cannot be
controlled again.
The only solution was restarting...
Then I found intel-gpu-tools. Now without restarting I can write sudo
intel_backlight 100 and it increases the brightness again.
Do you know why it works at first boot, but not after logout & relogin?
Typing the command above in every 10 minutes after leaving computer
alone is so annoying.
Thanks.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: acpi (not installed)
ProcVersionSignature: Ubuntu 3.5.0-25.39-generic 3.5.7.4
Uname: Linux 3.5.0-25-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Sun Mar 10 23:30:59 2013
InstallationDate: Installed on 2013-02-18 (20 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MarkForUpload: True
SourcePackage: acpi
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: acpi (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal
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https://bugs.launchpad.net/bugs/1153381
Title:
Backlight cannot be controlled after logging out and relogin
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