Comment 3 for bug 1014240

I'm not sure about the specific source package - the login screen of LightDM or Xscreensaver once every 5-6 times after a boot/hibernate does not accept keyboard inputs and neither the touchpad works. However I don't think the issue is on those packages. Should likley be kernel or X related, somehow the keyboard/touchpad is initialized in an incorrect status.
This issue has been reported also in other Linux OS (while it works always fine in Win7).
I'll try to add some info more as reported in https://wiki.ubuntu.com/X/Troubleshooting (HAL, lspci output)