I have had this problem on the same hardware (Dell Inspiron 3847). Upgrading the kernel to 3.16.2 (using the "mainline" packages) seems to have solved it.
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1330255 Title: Unable to Detect USB Mouse and Keyboard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1330255/+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