Sounds like the kernel is losing track of it. Potentially rmmod'ing the appropriate usb module and the modprobing it again would also get it to work.
** Package changed: xorg (Ubuntu) => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/982508 Title: USB mouse at docking station ceases to work after screensaver goes active To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/982508/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs