I filed this bug: http://www.acpica.org/bugzilla/show_bug.cgi?id=931 and a bit later I read of a workaround in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/518002 which is to add "acpi_osi=Linux" in the kernel command line. Then the brightness keys work, but there's no indicator popup window for the brightness, which is no big deal.
** Bug watch added: www.acpica.org/bugzilla/ #931 http://www.acpica.org/bugzilla/show_bug.cgi?id=931 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/741223 Title: Natty: Unable to adjust brightness for Acer Aspire 5731, requires reboot to reflect change To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/741223/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
