I have the same double action acquired at the hot key press problem. I am not able to adjust the brightness neither using the hot keys nor the brightness applet. Blacklisting video module didnt't help.
Here is my bug entry which may help: https://bugs.launchpad.net/ubuntu/+source/gnome-power- manager/+bug/250067 -- [hardy] [regression] LCD brightness control (Dell) no longer works https://bugs.launchpad.net/bugs/212733 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