Hi, I have the same problem as heni, the same laptop model, tried the steps so far and I got the same result. Here is my lshal output.
** Attachment added: "lshal.output" http://launchpadlibrarian.net/29084894/lshal.output -- Strange LCD brightness up function implementation on the Acer Aspire 5720 https://bugs.launchpad.net/bugs/360795 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 [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
