Could you test the kernels at the URL below, it seems that some BIOSen have bad ACPI brightness interfaces which will now be being used, this kernel should detect and ignore these. It would be good to know if this fixes your issues:
http://people.ubuntu.com/~apw/lp311716-intrepid/ -- The slider brightness Applet has value inverted after the last update (2.6.27-11) https://bugs.launchpad.net/bugs/311716 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