Some updates from Gnome 2.20 to 2.22 may have broken it. I created a new user without any old configuration files in its home and dimming is working again if I put ac in or out.
** Changed in: hal (Ubuntu) Status: New => Fix Released -- G-P-M is unable to dim display anymore https://bugs.launchpad.net/bugs/201644 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs