I think I have found a workaround, for those running across this. I posted some info here, in this similar bug. https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/527157
The practical upshot of all this is that adding the kernel parameter acpi_backlight="vendor" seems to give me proper brightness levels across the board. There were some side effects, namely my screen would go to sleep (due to the power manager timer) and not wake up. I'd suggest setting your screen to never go to sleep unless you close the lid. This "fixed" the comatose screen issue for me. -- 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/839281 Title: Double brightness events after logging in. Status in Gnome Powermanager: New Status in “gnome-power-manager” package in Ubuntu: Confirmed Bug description: output of lsb_release -rd Description: Ubuntu oneiric (development branch) Release: 11.10 Package: gnome-settings-daemon: Installed: 3.1.90-0ubuntu1 Candidate: 3.1.90-0ubuntu1 Version table: *** 3.1.90-0ubuntu1 0 500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages 100 /var/lib/dpkg/status Expected result: At the login screen, brightness keys increase and decrease brightness by one step. After logging in, brightness keys continue to increase and decrease brightness by one step. Actual result: At the login screen, brightness keys increase and decrease brightness by one step (same as expected, OK.) After logging in, brightness increases and decreases by two steps whenever a brightness key is pressed. This specifically seems to apply to the POWER plugin for gnome-settings-daemon. setting "active" to false via "gsettings set org.gnome.settings-daemon.plugins.power active false" returns the behavior to normal, but removes the gnome power indicator. However, since the battery indicator is present at the login screen, there must be a second application, hotkey, etc, trying to change brightness. --- ApportVersion: 1.23-0ubuntu3 Architecture: amd64 DistroRelease: Ubuntu 11.10 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) NonfreeKernelModules: nvidia Package: upower 0.9.13-1 PackageArchitecture: amd64 ProcEnviron: PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4 Tags: oneiric running-unity Uname: Linux 3.0.0-12-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-power/+bug/839281/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
