tseliot seems to be affected too, restarting lightdm fixes it. The xorg.log doesn't show any changes between the broken and working run, which is why I suspect it's a greeter bug, not a xorg-server bug.
** Package changed: unity (Ubuntu) => lightdm (Ubuntu) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1264543 Title: Trusty sometimes boots with inactive keyboard ..... To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1264543/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp