Actually, it is not always switching to the "cyclic mode". This time, the screen went black right after unplugging, and I could bring it with the hotkeys to a level at which it was barely usable in a completely dark room. However, it did not become brighter by itself this time, as described above. Here is the output of lshal -m during unplugging, using the hotkeys to see at least a little bit on the screen and replugging.
** Attachment added: "lshal.log.txt" http://launchpadlibrarian.net/26423099/lshal.log.txt -- [jaunty] screen brightness level on battery power unsteady and too dark https://bugs.launchpad.net/bugs/373096 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
