One workaround is to use gizmod as described in the following ubuntu forum thread.
http://ubuntuforums.org/showthread.php?t=1585664 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/388547 Title: Volume keys don't work inside a full-screen game -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs