Maybe it is a Kernel issue. It was initiated in Dapper. As well in Dapper as in Edgy brightness keys aren't shown in xev nor in dmesg but at least they work in Dapper.
-- Sony tx brightness keys doesn't work anymore in edgy https://launchpad.net/bugs/64321 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
